Example Usage Scenarios:

The following are example usage scenarios for this profile:

• Query for pulse oximety observations for a patient
• Record or update pulse oximety observations belonging to a patient

Mandatory and Must Support Data Elements

In addition to the Mandatory and Must Support data elements in the US Core Vital Signs Profile, the following data-elements must always be present (Mandatory definition) or must be supported if the data is present in the sending system (Must Support definition). They are presented below in a simple human-readable explanation. Profile specific guidance and examples are provided as well. The Formal Views below provides the formal summary, definitions, and terminology requirements.

Each Observation Must Have:

1. a fixed code for oxygen saturation in arterial blood as defined in the FHIR oxygen saturation profile
2. a additional coding for oxygen saturation in arterial blood by pulse oximetry

Each Observation Must Support:

1. a value for oxygen saturation
2. a code for inspired oxygen concentration*
3. a value for inspired oxygen concentration

*see guidance below

Profile Specific Implementation Guidance:

• • Note that this profile also conforms to the base FHIR Vital Signs Profile.

• The observations MAY have additional codes that translate or map to the Observation code or category codes. For example:
  • providing a local system specific code
  • providing more specific codes such as 8306-3 - Body height - lying in addition to 8302-2 - Body height. Several additional observation codes are provided in the FHIR core specification vital signs table.

  a code system value SHOULD be supplied for each additional code.

• The observations MAY have component observations. For example, to qualify the vital sign observation 8310-5 - Body temperature, 8327-9 - Body temperature measurement site (oral, forehead, rectal, etc.) may be used as a component observation. Several of these are provided in the FHIR core specification vital signs table.
• *An Observation without a value, SHALL include a reason why the data is absent unless there are 1) component observations, or 2) reporting panel observations using Observation.hasMember.
  • For further guidance see the Observation Grouping section in FHIR Specification.
  • Systems that never provide an observation without a value are not required to support Observation.dataAbsentReason.
• *An Observation.component without a value, SHALL include a reason why the data is absent.
  • Systems that never provide a component observation without a component value are not required to support Observation.component.dataAbsentReason.

• Implementers may use this profile as a base for other vital signs in addition to those in this guide.

• Inspired oxygen therapy may be represented with component observations when measured at the same time as the pulse oximetry measurements. They are expressed as inhaled oxygen flow rate (e.g., 6 liters/min) and as inhaled oxygen concentration (e.g., 40% oxygen).
  • This profile is technically non-conformant with the base FHIR ver 4.0.1 vitals profile which defines a required binding that excludes the concept for L/min for Observation.component.value(x). This is a known issue in and it means validation errors may occur when validating against this version of the US Core Pulse Oximetry Profile. A change request to correct this has been applied to the base FHIR ver 4.3.0 (“Release 4B”).
• Many pulse oximetry readings are taken while the patient is breathing room air. The concept of “room air” (unmodified, ambient air)SHOULD be represented as an inhaled oxygen flow rate of 0 liters/min.
• A pulse oximetry reading without component inspired oxygen observations may imply that the measurement was performed while the patient was breathing room air or that the inspired oxygen reading was omitted. To remove this uncertainty, the inspired oxygen component observationsSHOULD be used.

• Differential Table
• Key Elements Table
• Snapshot Table
• Statistics/References
• All

This structure is derived from USCoreVitalSignsProfile

Name	Flags	Card.	Type	Description & Constraints
Observation		0..*	USCoreVitalSignsProfile	US Core Pulse Oximetry Profile
code	S	1..1	CodeableConcept	(USCDI) Oxygen Saturation by Pulse Oximetry
Slices for coding	S	0..*	Coding	(USCDI) Code defined by a terminology system Slice: Unordered, Open by pattern:$this
coding:PulseOx	S	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 59408-5
coding:O2Sat	S	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 2708-6
valueQuantity	S	0..1	Quantity	(USCDI) Oxygen Saturation by Pulse Oximetry Value
value	S	1..1	decimal	(USCDI) Numerical value (with implicit precision)
unit	S	1..1	string	(USCDI) Unit representation
system	S	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	S	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
Slices for component	S	0..*	BackboneElement	(USCDI) Used when reporting flow rates or oxygen concentration. Slice: Unordered, Open by pattern:code
component:FlowRate	S	0..1	BackboneElement	(USCDI) Inhaled oxygen flow rate
code	S	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3151-8
valueQuantity	S	0..1	Quantity S	(USCDI) Vital Sign Component Value
value	S	1..1	decimal	(USCDI) Numerical value (with implicit precision)
unit	S	1..1	string	(USCDI) Unit representation
system	S	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	S	1..1	code	(USCDI) Coded form of the unit Fixed Value: L/min
component:Concentration	S	0..1	BackboneElement	(USCDI) Inhaled oxygen concentration
code	S	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3150-0
valueQuantity	S	0..1	Quantity S	(USCDI) Vital Sign Component Value
value	S	1..1	decimal	(USCDI) Numerical value (with implicit precision)
unit	S	1..1	string	(USCDI) Unit representation
system	S	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	S	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
Documentation for this format

Name	Flags	Card.	Type	Description & Constraints
Observation	C	0..*	USCoreVitalSignsProfile	US Core Pulse Oximetry Profile
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required)
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by value:coding.code, value:coding.system Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:VSCat	S	1..1	CodeableConcept	(USCDI) Classification of type of observation Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
coding	SΣ	1..*	Coding	(USCDI) Code defined by a terminology system
system	SΣ	1..1	uri	(USCDI) Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
code	SΣ	1..1	code	(USCDI) Symbol in syntax defined by the system Fixed Value: vital-signs
code	SΣ	1..1	CodeableConcept	(USCDI) Oxygen Saturation by Pulse Oximetry Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
Slices for coding	SΣ	0..*	Coding	(USCDI) Code defined by a terminology system Slice: Unordered, Open by pattern:$this
coding:PulseOx	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 59408-5
coding:O2Sat	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 2708-6
subject	SΣ	1..1	Reference(US Core Patient Profile)	(USCDI) Who and/or what the observation is about
effective[x]	SΣC	1..1		(USCDI) Often just a dateTime for Vital Signs
effectiveDateTime			dateTime
Slices for value[x]	SΣC	0..1		(USCDI) Vital Signs Value Slice: Unordered, Open by type:$this Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity
value[x]:valueQuantity	SΣC	0..1	Quantity	(USCDI) Oxygen Saturation by Pulse Oximetry Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Slices for component	SΣC	0..*	BackboneElement	(USCDI) Used when reporting flow rates or oxygen concentration. Slice: Unordered, Open by pattern:code
component:All Slices				Content/Rules for all slices
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
value[x]	SΣC	0..1		(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
component:FlowRate	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen flow rate
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3151-8
value[x]	SΣC	0..1	Quantity	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: L/min
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
component:Concentration	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen concentration
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3150-0
value[x]	SΣC	0..1	Quantity	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code
Observation.status	required	ObservationStatus
Observation.category	preferred	ObservationCategoryCodes
Observation.category:VSCat	preferred	ObservationCategoryCodes
Observation.code	extensible	UsCoreVitalSigns
Observation.value[x]	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity.comparator	required	QuantityComparator
Observation.dataAbsentReason	extensible	DataAbsentReason
Observation.component.code	extensible	UsCoreVitalSigns
Observation.component.value[x]	extensible	VitalSignsUnits
Observation.component.dataAbsentReason	extensible	DataAbsentReason
Observation.component:FlowRate.code	extensible	Pattern: LOINC code 3151-8
Observation.component:FlowRate.value[x]	extensible	VitalSignsUnits
Observation.component:FlowRate.value[x].comparator	required	QuantityComparator
Observation.component:FlowRate.dataAbsentReason	extensible	DataAbsentReason
Observation.component:Concentration.code	extensible	Pattern: LOINC code 3150-0
Observation.component:Concentration.value[x]	extensible	VitalSignsUnits
Observation.component:Concentration.value[x].comparator	required	QuantityComparator
Observation.component:Concentration.dataAbsentReason	extensible	DataAbsentReason

Constraints

Id	Grade	Path(s)	Details	Requirements
dom-2	error	Observation	If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty()
dom-3	error	Observation	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Observation	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Observation	If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty()
dom-6	best practice	Observation	A resource should have narrative for robust management : text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-6	error	Observation	dataAbsentReason SHALL only be present if Observation.value[x] is not present : dataAbsentReason.empty() or value.empty()
obs-7	error	Observation	If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present : value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty()
vs-1	error	Observation.effective[x]	if Observation.effective[x] is dateTime and has a value then that value shall be precise to the day : ($this as dateTime).toString().length() >= 8
vs-2	error	Observation	If there is no component or hasMember element then either a value[x] or a data absent reason must be present. : (component.empty() and hasMember.empty()) implies (dataAbsentReason.exists() or value.exists())
vs-3	error	Observation.component, Observation.component:FlowRate, Observation.component:Concentration	If there is no a value a data absent reason must be present : value.exists() or dataAbsentReason.exists()

Name	Flags	Card.	Type	Description & Constraints
Observation	C	0..*	USCoreVitalSignsProfile	US Core Pulse Oximetry Profile
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: CommonLanguages (preferred): A human language. Additional Bindings Purpose AllLanguages Max Binding
text		0..1	Narrative	Text summary of the resource, for human interpretation
contained		0..*	Resource	Contained, inline Resources
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..*	Identifier	Business Identifier for observation
basedOn	Σ	0..*	Reference(CarePlan | DeviceRequest | ImmunizationRecommendation | MedicationRequest | NutritionOrder | ServiceRequest)	Fulfills plan, proposal or order
partOf	Σ	0..*	Reference(MedicationAdministration | MedicationDispense | MedicationStatement | Procedure | Immunization | ImagingStudy)	Part of referenced event
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required)
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by value:coding.code, value:coding.system Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:VSCat	S	1..1	CodeableConcept	(USCDI) Classification of type of observation Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
coding	SΣ	1..*	Coding	(USCDI) Code defined by a terminology system
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
system	SΣ	1..1	uri	(USCDI) Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
version	Σ	0..1	string	Version of the system - if relevant
code	SΣ	1..1	code	(USCDI) Symbol in syntax defined by the system Fixed Value: vital-signs
display	Σ	0..1	string	Representation defined by the system
userSelected	Σ	0..1	boolean	If this coding was chosen directly by the user
text	Σ	0..1	string	Plain text representation of the concept
code	SΣ	1..1	CodeableConcept	(USCDI) Oxygen Saturation by Pulse Oximetry Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
Slices for coding	SΣ	0..*	Coding	(USCDI) Code defined by a terminology system Slice: Unordered, Open by pattern:$this
coding:PulseOx	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 59408-5
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
coding:O2Sat	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 2708-6
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text	Σ	0..1	string	Plain text representation of the concept
subject	SΣ	1..1	Reference(US Core Patient Profile)	(USCDI) Who and/or what the observation is about
focus	ΣTU	0..*	Reference(Resource)	What the observation is about, when it is not about the subject of record
encounter	Σ	0..1	Reference(Encounter)	Healthcare event during which this observation is made
effective[x]	SΣC	1..1		(USCDI) Often just a dateTime for Vital Signs
effectiveDateTime			dateTime S
effectivePeriod			Period
issued	Σ	0..1	instant	Date/Time this version was made available
performer	Σ	0..*	Reference(Practitioner | PractitionerRole | Organization | CareTeam | Patient | RelatedPerson)	Who is responsible for the observation
Slices for value[x]	SΣC	0..1		(USCDI) Vital Signs Value Slice: Unordered, Open by type:$this Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity S
valueCodeableConcept			CodeableConcept
valueString			string
valueBoolean			boolean
valueInteger			integer
valueRange			Range
valueRatio			Ratio
valueSampledData			SampledData
valueTime			time
valueDateTime			dateTime
valuePeriod			Period
value[x]:valueQuantity	SΣC	0..1	Quantity	(USCDI) Oxygen Saturation by Pulse Oximetry Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
note		0..*	Annotation	Comments about the observation
bodySite		0..1	CodeableConcept	Observed body part Binding: SNOMEDCTBodyStructures (example): Codes describing anatomical locations. May include laterality.
method		0..1	CodeableConcept	How it was done Binding: ObservationMethods (example): Methods for simple observations.
specimen		0..1	Reference(Specimen)	Specimen used for this observation
device		0..1	Reference(Device | DeviceMetric)	(Measurement) Device
referenceRange	C	0..*	BackboneElement	Provides guide for interpretation
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
low	C	0..1	SimpleQuantity	Low Range, if relevant
high	C	0..1	SimpleQuantity	High Range, if relevant
type		0..1	CodeableConcept	Reference range qualifier Binding: ObservationReferenceRangeMeaningCodes (preferred): Code for the meaning of a reference range.
appliesTo		0..*	CodeableConcept	Reference range population Binding: ObservationReferenceRangeAppliesToCodes (example): Codes identifying the population the reference range applies to.
age		0..1	Range	Applicable age range, if relevant
text		0..1	string	Text based reference range in an observation
hasMember	Σ	0..*	Reference(QuestionnaireResponse | MolecularSequence | Vital Signs Profile)	Used when reporting vital signs panel components
derivedFrom	Σ	0..*	Reference(DocumentReference | ImagingStudy | Media | QuestionnaireResponse | MolecularSequence | Vital Signs Profile)	Related measurements the observation is made from
Slices for component	SΣC	0..*	BackboneElement	(USCDI) Used when reporting flow rates or oxygen concentration. Slice: Unordered, Open by pattern:code
component:All Slices				Content/Rules for all slices
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
value[x]	SΣC	0..1		(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity S
valueCodeableConcept			CodeableConcept
valueString			string
valueBoolean			boolean
valueInteger			integer
valueRange			Range
valueRatio			Ratio
valueSampledData			SampledData
valueTime			time
valueDateTime			dateTime
valuePeriod			Period
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
component:FlowRate	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen flow rate
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3151-8
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣC	0..1	Quantity S	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: L/min
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
component:Concentration	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen concentration
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3150-0
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣC	0..1	Quantity S	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code
Observation.language	preferred	CommonLanguages Additional Bindings Purpose AllLanguages Max Binding
Observation.status	required	ObservationStatus
Observation.category	preferred	ObservationCategoryCodes
Observation.category:VSCat	preferred	ObservationCategoryCodes
Observation.code	extensible	UsCoreVitalSigns
Observation.value[x]	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity.comparator	required	QuantityComparator
Observation.dataAbsentReason	extensible	DataAbsentReason
Observation.interpretation	extensible	ObservationInterpretationCodes
Observation.bodySite	example	SNOMEDCTBodyStructures
Observation.method	example	ObservationMethods
Observation.referenceRange.type	preferred	ObservationReferenceRangeMeaningCodes
Observation.referenceRange.appliesTo	example	ObservationReferenceRangeAppliesToCodes
Observation.component.code	extensible	UsCoreVitalSigns
Observation.component.value[x]	extensible	VitalSignsUnits
Observation.component.dataAbsentReason	extensible	DataAbsentReason
Observation.component.interpretation	extensible	ObservationInterpretationCodes
Observation.component:FlowRate.code	extensible	Pattern: LOINC code 3151-8
Observation.component:FlowRate.value[x]	extensible	VitalSignsUnits
Observation.component:FlowRate.value[x].comparator	required	QuantityComparator
Observation.component:FlowRate.dataAbsentReason	extensible	DataAbsentReason
Observation.component:FlowRate.interpretation	extensible	ObservationInterpretationCodes
Observation.component:Concentration.code	extensible	Pattern: LOINC code 3150-0
Observation.component:Concentration.value[x]	extensible	VitalSignsUnits
Observation.component:Concentration.value[x].comparator	required	QuantityComparator
Observation.component:Concentration.dataAbsentReason	extensible	DataAbsentReason
Observation.component:Concentration.interpretation	extensible	ObservationInterpretationCodes

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-3	error	Observation.referenceRange	Must have at least a low or a high or text : low.exists() or high.exists() or text.exists()
vs-1	error	Observation.effective[x]	if Observation.effective[x] is dateTime and has a value then that value shall be precise to the day : ($this as dateTime).toString().length() >= 8
vs-3	error	Observation.component, Observation.component:FlowRate, Observation.component:Concentration	If there is no a value a data absent reason must be present : value.exists() or dataAbsentReason.exists()

Differential View

This structure is derived from USCoreVitalSignsProfile

Name	Flags	Card.	Type	Description & Constraints
Observation		0..*	USCoreVitalSignsProfile	US Core Pulse Oximetry Profile
code	S	1..1	CodeableConcept	(USCDI) Oxygen Saturation by Pulse Oximetry
Slices for coding	S	0..*	Coding	(USCDI) Code defined by a terminology system Slice: Unordered, Open by pattern:$this
coding:PulseOx	S	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 59408-5
coding:O2Sat	S	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 2708-6
valueQuantity	S	0..1	Quantity	(USCDI) Oxygen Saturation by Pulse Oximetry Value
value	S	1..1	decimal	(USCDI) Numerical value (with implicit precision)
unit	S	1..1	string	(USCDI) Unit representation
system	S	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	S	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
Slices for component	S	0..*	BackboneElement	(USCDI) Used when reporting flow rates or oxygen concentration. Slice: Unordered, Open by pattern:code
component:FlowRate	S	0..1	BackboneElement	(USCDI) Inhaled oxygen flow rate
code	S	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3151-8
valueQuantity	S	0..1	Quantity S	(USCDI) Vital Sign Component Value
value	S	1..1	decimal	(USCDI) Numerical value (with implicit precision)
unit	S	1..1	string	(USCDI) Unit representation
system	S	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	S	1..1	code	(USCDI) Coded form of the unit Fixed Value: L/min
component:Concentration	S	0..1	BackboneElement	(USCDI) Inhaled oxygen concentration
code	S	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3150-0
valueQuantity	S	0..1	Quantity S	(USCDI) Vital Sign Component Value
value	S	1..1	decimal	(USCDI) Numerical value (with implicit precision)
unit	S	1..1	string	(USCDI) Unit representation
system	S	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	S	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
Documentation for this format

Key Elements View

Name	Flags	Card.	Type	Description & Constraints
Observation	C	0..*	USCoreVitalSignsProfile	US Core Pulse Oximetry Profile
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required)
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by value:coding.code, value:coding.system Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:VSCat	S	1..1	CodeableConcept	(USCDI) Classification of type of observation Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
coding	SΣ	1..*	Coding	(USCDI) Code defined by a terminology system
system	SΣ	1..1	uri	(USCDI) Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
code	SΣ	1..1	code	(USCDI) Symbol in syntax defined by the system Fixed Value: vital-signs
code	SΣ	1..1	CodeableConcept	(USCDI) Oxygen Saturation by Pulse Oximetry Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
Slices for coding	SΣ	0..*	Coding	(USCDI) Code defined by a terminology system Slice: Unordered, Open by pattern:$this
coding:PulseOx	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 59408-5
coding:O2Sat	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 2708-6
subject	SΣ	1..1	Reference(US Core Patient Profile)	(USCDI) Who and/or what the observation is about
effective[x]	SΣC	1..1		(USCDI) Often just a dateTime for Vital Signs
effectiveDateTime			dateTime
Slices for value[x]	SΣC	0..1		(USCDI) Vital Signs Value Slice: Unordered, Open by type:$this Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity
value[x]:valueQuantity	SΣC	0..1	Quantity	(USCDI) Oxygen Saturation by Pulse Oximetry Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Slices for component	SΣC	0..*	BackboneElement	(USCDI) Used when reporting flow rates or oxygen concentration. Slice: Unordered, Open by pattern:code
component:All Slices				Content/Rules for all slices
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
value[x]	SΣC	0..1		(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
component:FlowRate	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen flow rate
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3151-8
value[x]	SΣC	0..1	Quantity	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: L/min
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
component:Concentration	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen concentration
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3150-0
value[x]	SΣC	0..1	Quantity	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code
Observation.status	required	ObservationStatus
Observation.category	preferred	ObservationCategoryCodes
Observation.category:VSCat	preferred	ObservationCategoryCodes
Observation.code	extensible	UsCoreVitalSigns
Observation.value[x]	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity.comparator	required	QuantityComparator
Observation.dataAbsentReason	extensible	DataAbsentReason
Observation.component.code	extensible	UsCoreVitalSigns
Observation.component.value[x]	extensible	VitalSignsUnits
Observation.component.dataAbsentReason	extensible	DataAbsentReason
Observation.component:FlowRate.code	extensible	Pattern: LOINC code 3151-8
Observation.component:FlowRate.value[x]	extensible	VitalSignsUnits
Observation.component:FlowRate.value[x].comparator	required	QuantityComparator
Observation.component:FlowRate.dataAbsentReason	extensible	DataAbsentReason
Observation.component:Concentration.code	extensible	Pattern: LOINC code 3150-0
Observation.component:Concentration.value[x]	extensible	VitalSignsUnits
Observation.component:Concentration.value[x].comparator	required	QuantityComparator
Observation.component:Concentration.dataAbsentReason	extensible	DataAbsentReason

Constraints

Id	Grade	Path(s)	Details	Requirements
dom-2	error	Observation	If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty()
dom-3	error	Observation	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Observation	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Observation	If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty()
dom-6	best practice	Observation	A resource should have narrative for robust management : text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-6	error	Observation	dataAbsentReason SHALL only be present if Observation.value[x] is not present : dataAbsentReason.empty() or value.empty()
obs-7	error	Observation	If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present : value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty()
vs-1	error	Observation.effective[x]	if Observation.effective[x] is dateTime and has a value then that value shall be precise to the day : ($this as dateTime).toString().length() >= 8
vs-2	error	Observation	If there is no component or hasMember element then either a value[x] or a data absent reason must be present. : (component.empty() and hasMember.empty()) implies (dataAbsentReason.exists() or value.exists())
vs-3	error	Observation.component, Observation.component:FlowRate, Observation.component:Concentration	If there is no a value a data absent reason must be present : value.exists() or dataAbsentReason.exists()

Snapshot View

Name	Flags	Card.	Type	Description & Constraints
Observation	C	0..*	USCoreVitalSignsProfile	US Core Pulse Oximetry Profile
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: CommonLanguages (preferred): A human language. Additional Bindings Purpose AllLanguages Max Binding
text		0..1	Narrative	Text summary of the resource, for human interpretation
contained		0..*	Resource	Contained, inline Resources
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..*	Identifier	Business Identifier for observation
basedOn	Σ	0..*	Reference(CarePlan | DeviceRequest | ImmunizationRecommendation | MedicationRequest | NutritionOrder | ServiceRequest)	Fulfills plan, proposal or order
partOf	Σ	0..*	Reference(MedicationAdministration | MedicationDispense | MedicationStatement | Procedure | Immunization | ImagingStudy)	Part of referenced event
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required)
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by value:coding.code, value:coding.system Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:VSCat	S	1..1	CodeableConcept	(USCDI) Classification of type of observation Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
coding	SΣ	1..*	Coding	(USCDI) Code defined by a terminology system
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
system	SΣ	1..1	uri	(USCDI) Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
version	Σ	0..1	string	Version of the system - if relevant
code	SΣ	1..1	code	(USCDI) Symbol in syntax defined by the system Fixed Value: vital-signs
display	Σ	0..1	string	Representation defined by the system
userSelected	Σ	0..1	boolean	If this coding was chosen directly by the user
text	Σ	0..1	string	Plain text representation of the concept
code	SΣ	1..1	CodeableConcept	(USCDI) Oxygen Saturation by Pulse Oximetry Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
Slices for coding	SΣ	0..*	Coding	(USCDI) Code defined by a terminology system Slice: Unordered, Open by pattern:$this
coding:PulseOx	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 59408-5
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
coding:O2Sat	SΣ	1..1	Coding	(USCDI) Code defined by a terminology system Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 2708-6
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text	Σ	0..1	string	Plain text representation of the concept
subject	SΣ	1..1	Reference(US Core Patient Profile)	(USCDI) Who and/or what the observation is about
focus	ΣTU	0..*	Reference(Resource)	What the observation is about, when it is not about the subject of record
encounter	Σ	0..1	Reference(Encounter)	Healthcare event during which this observation is made
effective[x]	SΣC	1..1		(USCDI) Often just a dateTime for Vital Signs
effectiveDateTime			dateTime S
effectivePeriod			Period
issued	Σ	0..1	instant	Date/Time this version was made available
performer	Σ	0..*	Reference(Practitioner | PractitionerRole | Organization | CareTeam | Patient | RelatedPerson)	Who is responsible for the observation
Slices for value[x]	SΣC	0..1		(USCDI) Vital Signs Value Slice: Unordered, Open by type:$this Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity S
valueCodeableConcept			CodeableConcept
valueString			string
valueBoolean			boolean
valueInteger			integer
valueRange			Range
valueRatio			Ratio
valueSampledData			SampledData
valueTime			time
valueDateTime			dateTime
valuePeriod			Period
value[x]:valueQuantity	SΣC	0..1	Quantity	(USCDI) Oxygen Saturation by Pulse Oximetry Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
note		0..*	Annotation	Comments about the observation
bodySite		0..1	CodeableConcept	Observed body part Binding: SNOMEDCTBodyStructures (example): Codes describing anatomical locations. May include laterality.
method		0..1	CodeableConcept	How it was done Binding: ObservationMethods (example): Methods for simple observations.
specimen		0..1	Reference(Specimen)	Specimen used for this observation
device		0..1	Reference(Device | DeviceMetric)	(Measurement) Device
referenceRange	C	0..*	BackboneElement	Provides guide for interpretation
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
low	C	0..1	SimpleQuantity	Low Range, if relevant
high	C	0..1	SimpleQuantity	High Range, if relevant
type		0..1	CodeableConcept	Reference range qualifier Binding: ObservationReferenceRangeMeaningCodes (preferred): Code for the meaning of a reference range.
appliesTo		0..*	CodeableConcept	Reference range population Binding: ObservationReferenceRangeAppliesToCodes (example): Codes identifying the population the reference range applies to.
age		0..1	Range	Applicable age range, if relevant
text		0..1	string	Text based reference range in an observation
hasMember	Σ	0..*	Reference(QuestionnaireResponse | MolecularSequence | Vital Signs Profile)	Used when reporting vital signs panel components
derivedFrom	Σ	0..*	Reference(DocumentReference | ImagingStudy | Media | QuestionnaireResponse | MolecularSequence | Vital Signs Profile)	Related measurements the observation is made from
Slices for component	SΣC	0..*	BackboneElement	(USCDI) Used when reporting flow rates or oxygen concentration. Slice: Unordered, Open by pattern:code
component:All Slices				Content/Rules for all slices
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs.
value[x]	SΣC	0..1		(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
valueQuantity			Quantity S
valueCodeableConcept			CodeableConcept
valueString			string
valueBoolean			boolean
valueInteger			integer
valueRange			Range
valueRatio			Ratio
valueSampledData			SampledData
valueTime			time
valueDateTime			dateTime
valuePeriod			Period
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
component:FlowRate	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen flow rate
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3151-8
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣC	0..1	Quantity S	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: L/min
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
component:Concentration	SΣC	0..1	BackboneElement	(USCDI) Inhaled oxygen concentration
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI) Type of component observation (code / type) Binding: US Core Vital Signs ValueSet (extensible): The vital sign codes from the base FHIR and US Core Vital Signs. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://loinc.org
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: 3150-0
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣC	0..1	Quantity S	(USCDI) Vital Sign Component Value Binding: VitalSignsUnits (extensible): Common UCUM units for recording Vital Signs.
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
value	SΣ	1..1	decimal	(USCDI) Numerical value (with implicit precision)
comparator	?!Σ	0..1	code	< | <= | >= | > - how to understand the value Binding: QuantityComparator (required): How the Quantity should be understood and represented.
unit	SΣ	1..1	string	(USCDI) Unit representation
system	SΣC	1..1	uri	(USCDI) System that defines coded unit form Fixed Value: http://unitsofmeasure.org
code	SΣ	1..1	code	(USCDI) Coded form of the unit Fixed Value: %
dataAbsentReason	SC	0..1	CodeableConcept	(USCDI) Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code
Observation.language	preferred	CommonLanguages Additional Bindings Purpose AllLanguages Max Binding
Observation.status	required	ObservationStatus
Observation.category	preferred	ObservationCategoryCodes
Observation.category:VSCat	preferred	ObservationCategoryCodes
Observation.code	extensible	UsCoreVitalSigns
Observation.value[x]	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity	extensible	VitalSignsUnits
Observation.value[x]:valueQuantity.comparator	required	QuantityComparator
Observation.dataAbsentReason	extensible	DataAbsentReason
Observation.interpretation	extensible	ObservationInterpretationCodes
Observation.bodySite	example	SNOMEDCTBodyStructures
Observation.method	example	ObservationMethods
Observation.referenceRange.type	preferred	ObservationReferenceRangeMeaningCodes
Observation.referenceRange.appliesTo	example	ObservationReferenceRangeAppliesToCodes
Observation.component.code	extensible	UsCoreVitalSigns
Observation.component.value[x]	extensible	VitalSignsUnits
Observation.component.dataAbsentReason	extensible	DataAbsentReason
Observation.component.interpretation	extensible	ObservationInterpretationCodes
Observation.component:FlowRate.code	extensible	Pattern: LOINC code 3151-8
Observation.component:FlowRate.value[x]	extensible	VitalSignsUnits
Observation.component:FlowRate.value[x].comparator	required	QuantityComparator
Observation.component:FlowRate.dataAbsentReason	extensible	DataAbsentReason
Observation.component:FlowRate.interpretation	extensible	ObservationInterpretationCodes
Observation.component:Concentration.code	extensible	Pattern: LOINC code 3150-0
Observation.component:Concentration.value[x]	extensible	VitalSignsUnits
Observation.component:Concentration.value[x].comparator	required	QuantityComparator
Observation.component:Concentration.dataAbsentReason	extensible	DataAbsentReason
Observation.component:Concentration.interpretation	extensible	ObservationInterpretationCodes

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-3	error	Observation.referenceRange	Must have at least a low or a high or text : low.exists() or high.exists() or text.exists()
vs-1	error	Observation.effective[x]	if Observation.effective[x] is dateTime and has a value then that value shall be precise to the day : ($this as dateTime).toString().length() >= 8
vs-3	error	Observation.component, Observation.component:FlowRate, Observation.component:Concentration	If there is no a value a data absent reason must be present : value.exists() or dataAbsentReason.exists()

This structure is derived from USCoreVitalSignsProfile

Summary

Mandatory: 2 elements (12 nested mandatory elements)
Must-Support: 24 elements
Fixed Value: 6 elements

Slices

This structure defines the following Slices:

• The element Observation.code.coding is sliced based on the value of pattern:$this
• The element Observation.component is sliced based on the value of pattern:code