Extension: focal-subject

R4 Draft for Comment

This page is part of the FHIR Specification (v3.2.0: R4 Ballot 1). The current version which supercedes this version is 5.0.0. For a full list of available versions, see the Directory of published versions . Page versions: R3 R2

Extension focal-subject - Detailed Descriptions

Orders and Observations Work Group

Maturity Level: 1

Informative

Use Context: Any

Detailed Descriptions for the elements in the extension.

Extension
Definition	The focus of an observation when the focus is not the patient of record. In other words, the focus of the observation is different from `Observation.subject`. An example use case would be using the Observation resource to capture whether the mother is trained to change her child's trachestomy tube. In this example, the child is the patient of record and the mother is focal subject referenced using this extension. Other example focal subjects include spouses, related persons, feti, or donors.
Control	0..* This element is affected by the following invariants: ele-1
Is Modifier	true
Comments	Use Observation.specimen element to describe the specimen. Only used if not implicit in code found in Observation.code.
Invariants	Defined on this element ele-1: All FHIR elements must have a @value or children (xpath: @value\|f:\|h:div) ext-1: Must have either extensions or value[x], not both (xpath: exists(f:extension)!=exists(f:[starts-with(local-name(.), 'value')]))
Extension.id
Definition	unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Control	0..1
Type	string
Extension.extension
Definition	May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.
Control	0..*
Type	Extension
Alternate Names	extensions, user content
Comments	There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
Slicing	This element introduces a set of slices. The slicing rules are: unordered Open discriminators: value:url
Extension.extension(code)
Definition	A code representing the focal subject.
Control	0..1
Type	Extension
Extension.extension.id
Definition	unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Control	0..1
Type	string
Extension.extension.extension
Definition	An Extension
Control	0..0
Type	Extension
Slicing	This element introduces a set of slices. The slicing rules are: unordered Open discriminators: value:url
Extension.extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Fixed Value	code
Extension.extension.valueCodeableConcept
Definition	Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).
Control	0..1
Terminology Binding	Codes for observation targets. Derived from both HL7 v3 and SNOMED CT code systems For example codes, see Focal Subject Codes
Type	CodeableConcept
Extension.extension(reference)
Definition	A reference to another entity that represents the focal subject ( e.g., a RelatedPerson).
Control	0..1
Type	Extension
Extension.extension.id
Definition	unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
Control	0..1
Type	string
Extension.extension.extension
Definition	An Extension
Control	0..0
Type	Extension
Slicing	This element introduces a set of slices. The slicing rules are: unordered Open discriminators: value:url
Extension.extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Fixed Value	reference
Extension.extension.value[x]
Definition	Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).
Control	1..1
Type	Choice of: Reference(Patient), Reference(Person), Reference(RelatedPerson), Reference(Group), Reference(Device)
[x] Note	See Choice of Data Types for further information about how to use [x]
Extension.url
Definition	Source of the definition for the extension code - a logical name or a URL.
Control	1..1
Type	uri
Comments	The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.
Fixed Value	http://hl7.org/fhir/StructureDefinition/observation-focal-subject
Extension.value[x]
Definition	Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list).
Control	0..0
Type	Choice of: base64Binary, boolean, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, Dosage, ContactDetail, Contributor, DataRequirement, ParameterDefinition, RelatedArtifact, TriggerDefinition, UsageContext, Meta
[x] Note	See Choice of Data Types for further information about how to use [x]