This table lists extensions for the Observation resource defined in association with the core specification. For background information, see
Extensibility.
Additional extensions may be found in published
Implementation Guides 
and in the
Conformance resource registry .
| Identity | Conf. | Type | Context | WG | Status | Δ v1.0.0 |
| Extensions defined for the Observation resource |
| bodySite | 0..1 | Reference | Condition.bodySite, Observation.bodySite, Procedure.bodySite, MedicationAdministration.dose,
Dosage.site | fhir | Trial-Use: FMM3 | n/c |
| diagnosticReport-risk | 0..* | Reference | DiagnosticReport, Observation | oo | Trial-Use: FMM3 |  Changed: |
| event-eventHistory | 0..* | Reference | Observation, DiagnosticReport, Task, SupplyDelivery, DeviceUsage | fhir | Trial-Use: FMM3 | n/c |
| event-location | 0..1 | Reference | Observation, DiagnosticReport, DocumentReference, MedicationDispense,
MedicationAdministration, SupplyDelivery | fhir | Trial-Use: FMM3 | n/c |
| event-performerFunction | 0..1 | CodeableConcept | Observation.performer, DiagnosticReport.performer, DocumentReference.author,
Consent.grantee | fhir | Trial-Use: FMM3 | n/c |
| event-statusReason | 0..1 | CodeableConcept | Observation, DiagnosticReport, DocumentReference, SupplyDelivery,
DeviceUsage | fhir | Trial-Use: FMM3 | Changed: |
| observation-analysis-date-time | 0..1 | dateTime | Observation | oo | Trial-Use: FMM0 |  Added: |
| observation-bodyPosition | 0..1 | CodeableConcept | Observation, Specimen.collection | oo | Trial-Use: FMM3 | Changed: |
| observation-componentCategory | 0..* | CodeableConcept | Observation.component | oo | Trial-Use: FMM0 | Added: |
| observation-delta | 0..1 | CodeableConcept | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-deviceCode | 0..1 | CodeableConcept | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-focusCode | 0..1 | CodeableConcept | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-gatewayDevice | 0..1 | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-geneticsAllele | 0..1 | (complex) | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsAminoAcidChange | 0..1 | (complex) | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsAncestry | 0..1 | (complex) | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsCopyNumberEvent | 0..1 | CodeableConcept | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsDNARegionName | 0..1 | string | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsGene | 0..1 | CodeableConcept | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsGenomicSourceClass | 0..1 | CodeableConcept | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsInterpretation | 0..1 | Reference | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsPhaseSet | 0..* | (complex) | Observation | oo | Deprecated: FMM1 | Added: |
| observation-geneticsVariant | 0..1 | (complex) | Observation | oo | Deprecated: FMM1 | Added: |
| observation-nature-of-abnormal-test | 0..* | CodeableConcept | Observation | oo | Trial-Use: FMM0 | Added: |
| observation-precondition | 0..* | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-reagent | 0..* | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-replaces | 0..* | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-secondaryFinding | 0..1 | CodeableConcept | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-sequelTo | 0..* | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-specimenCode | 0..1 | CodeableConcept | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-structure-type | 0..1 | CodeableConcept | Observation | oo | Draft: FMM1 | Added: |
| observation-timeOffset | 0..* | integer | Observation.component | oo | Trial-Use: FMM3 | Changed: |
| observation-v2-subid | 0..1 | (complex) | Observation | oo | Trial-Use: FMM0 | Added: |
| workflow-adheresTo | 0..* | (Choice) | CarePlan, Condition, Communication, DiagnosticReport, DocumentReference,
Encounter, FamilyMemberHistory, Immunization, ImmunizationEvaluation,
Observation, Procedure, QuestionnaireResponse, SupplyDelivery | fhir | Trial-Use: FMM2 | Changed: |
| workflow-episodeOfCare | 0..* | Reference | AdverseEvent, Appointment, Basic, CarePlan, ClinicalImpression, Communication,
CommunicationRequest, Composition, Condition, Consent, DetectedIssue,
DeviceRequest, DeviceUsage, DiagnosticReport, DocumentReference, EnrollmentRequest,
EnrollmentResponse, FamilyMemberHistory, Flag, Goal, ImagingStudy,
Immunization, ImmunizationEvaluation, ImmunizationRecommendation,
Invoice, List, MeasureReport, MedicationAdministration, MedicationDispense,
MedicationRequest, MedicationStatement, MolecularSequence, NutritionIntake,
NutritionOrder, Observation, Procedure, QuestionnaireResponse, RequestOrchestration,
ResearchSubject, RiskAssessment, SupplyDelivery, SupplyRequest, VisionPrescription,
ServiceRequest, ChargeItem | fhir | Trial-Use: FMM3 | n/c |
| workflow-instantiatesCanonical | 0..* | canonical | Observation, DiagnosticReport, Media, Condition, SupplyDelivery, CommunicationRequest,
SupplyRequest | fhir | Deprecated: FMM1 | Added: |
| workflow-instantiatesUri | 0..* | uri | Observation, DiagnosticReport, Media, Condition, SupplyDelivery, CommunicationRequest,
SupplyRequest | fhir | Deprecated: FMM1 | Added: |
| workflow-reason | 0..* | CodeableReference | Observation, DiagnosticReport, DocumentReference, Flag, NutritionOrder | fhir | Trial-Use: FMM2 | n/c |
| workflow-reasonCode | 0..* | CodeableConcept | Observation, DiagnosticReport, Media, NutritionOrder | fhir | Deprecated: FMM1 | Added: |
| workflow-reasonReference | 0..* | Reference | Observation, DiagnosticReport, Media, NutritionOrder | fhir | Deprecated: FMM1 | Added: |
| workflow-relatedArtifact | 0..* | RelatedArtifact | ConceptMap, DiagnosticReport, Observation, Observation.component | fhir | Trial-Use: FMM3 | n/c |
| workflow-researchStudy | 0..* | Reference | Composition, Consent, DeviceUsage, DiagnosticReport, Encounter, FamilyMemberHistory,
Immunization, DocumentReference, MedicationAdministration, MedicationDispense,
MedicationStatement, Observation, Procedure, QuestionnaireResponse,
RiskAssessment, ServiceRequest, SupplyDelivery, Task | fhir | Trial-Use: FMM3 | n/c |
| workflow-supportingInfo | 0..* | Reference | DiagnosticReport, DocumentReference, Encounter, Observation, CommunicationRequest | fhir | Trial-Use: FMM3 | n/c |
| workflow-triggeredBy | 0..1 | (Choice) | CarePlan, CarePlan.activity.plannedActivityDetail, CommunicationRequest,
DeviceRequest, Encounter, ImmunizationRecommendation, NutritionOrder,
Procedure, RequestOrchestration, SupplyRequest, ServiceRequest, Task,
Condition, Communication, DiagnosticReport, DocumentReference, FamilyMemberHistory,
Immunization, Observation, QuestionnaireResponse, SupplyDelivery | fhir | Trial-Use: FMM2 | n/c |
| Extensions defined for many resources including the Observation resource |
| datatype | 0..1 | string | Base | fhir | Trial-Use: FMM2 | n/c |
| artifact-approvalDate | 0..1 | date | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-author | 0..* | ContactDetail | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-citeAs | 0..1 | (Choice) | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-contact | 0..* | ContactDetail | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-copyright | 0..1 | markdown | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-copyrightLabel | 0..1 | string | Resource | cds | Experimental
Draft: FMM1 | Changed: |
| artifact-date | 0..1 | dateTime | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-description | 0..1 | markdown | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-effectivePeriod | 0..1 | Period | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-experimental | 0..1 | boolean | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-identifier | 0..* | Identifier | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-isOwned | 0..1 | boolean | RelatedArtifact, ActivityDefinition.library, PlanDefinition.library,
Measure.library, DomainResource.extension, type.exists() and type = 'composed-of' | cds | Trial-Use: FMM1 | Added: |
| artifact-jurisdiction | 0..* | CodeableConcept | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-lastReviewDate | 0..1 | date | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-name | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-publisher | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-purpose | 0..1 | markdown | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-relatedArtifact | 0..* | RelatedArtifact | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-releaseDescription | 0..1 | markdown | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-releaseLabel | 0..1 | string | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-status | 0..1M | code | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-title | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-topic | 0..* | CodeableConcept | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-url | 0..1 | uri | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-usage | 0..1 | markdown | Resource | cds | Trial-Use: FMM1 | Added: |
| artifact-useContext | 0..* | UsageContext | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-version | 0..1 | string | Resource | cds | Trial-Use: FMM2 | Changed: |
| artifact-versionAlgorithm | 0..1 | (Choice) | Resource | cds | Draft: FMM1 | Changed: |
| artifact-versionPolicy | 0..1 | CodeableConcept | Resource | cds | Trial-Use: FMM1 | Added: |
| artifactassessment-disposition | 0..1 | code | Resource | cds | Draft: FMM1 | Added: |
| artifactassessment-workflowStatus | 0..1 | code | Resource | cds | Draft: FMM1 | Added: |
| cqf-artifactComment | 0..* | (complex) | Resource | cds | Trial-Use: FMM3 | Changed: |
| cqf-citation | 0..1 | string | Resource | cds | Trial-Use: FMM3 | Changed: |
| cqf-definitionTerm | 0..1 | (complex) | Resource | cds | Trial-Use: FMM3 | Added: |
| cqf-directReferenceCode | 0..* | Coding | Resource | cds | Trial-Use: FMM2 | Changed: |
| cqf-knowledgeCapability | 0..* | code | DomainResource | cds | Trial-Use: FMM2 | Changed: |
| cqf-knowledgeRepresentationLevel | 0..* | code | DomainResource | cds | Trial-Use: FMM2 | Changed: |
| cqf-library | 0..* | canonical | DomainResource | cds | Trial-Use: FMM3 | Changed: |
| cqf-logicDefinition | 0..* | (complex) | DomainResource | cds | Trial-Use: FMM2 | Changed: |
| cqf-measureInfo | 0..* | (complex) | Resource, Reference | cds | Trial-Use: FMM3 | Changed: |
| cqf-messages | 0..* | Reference | Resource | cds | Trial-Use: FMM3 | Added: |
| cqf-scope | 0..1 | string | Resource | cds | Trial-Use: FMM1 | Added: |
| derivation-reference | 0..* | (complex) | Resource, Element | fhir | Trial-Use: FMM2 | n/c |
| feature-assertion | 0..* | Coding | Provenance.target, Resource.meta | fhir | Experimental
Draft: FMM0 | Added: |
| note | 0..* | Annotation | Resource, Composition.section | fhir | Trial-Use: FMM1 | Added: |
| obligations-profile | 0..* | (complex) | Provenance.target, Resource.meta | fhir | Experimental
Draft: FMM0 | Added: |
| package-source | 0..* | (complex) | Resource, Meta | fhir | Trial-Use: FMM1 | Added: |
| patient-sexParameterForClinicalUse | 0..* | (complex) | Resource | pa | Experimental
Draft: FMM1 | Changed: |
| resource-instance-description | 0..1 | markdown | Resource | fhir | Trial-Use: FMM2 | n/c |
| resource-instance-name | 0..1 | string | Resource | fhir | Trial-Use: FMM2 | n/c |
| resource-pertainsToGoal | 0..* | Reference | Resource | fhir | Trial-Use: FMM3 | Changed: |
| satisfies-requirement | 0..* | (complex) | Resource, Element | fhir | Trial-Use: FMM2 | Changed: |
| structuredefinition-fmm | 0..1 | integer | DomainResource, Resource | fhir | Trial-Use: FMM3 | n/c |
| structuredefinition-fmm-support | 0..1 | markdown | DomainResource | fhir | Trial-Use: FMM2 | n/c |
| structuredefinition-wg | 0..1 | code | DomainResource | fhir | Trial-Use: FMM3 | n/c |
| version-specific-use | 0..* | (complex) | Element, Resource | fhir | Trial-Use: FMM1 | Added: |
| version-specific-value | 0..* | (complex) | Element, Resource | fhir | Trial-Use: FMM1 | Added: |
| Extensions that refer to the Observation resource |
| family-member-history-genetics-observation | 0..* | Reference | FamilyMemberHistory | cg | Trial-Use: FMM3 | Changed: |
| observation-geneticsInterpretation | 0..1 | Reference | Observation | oo | Deprecated: FMM1 | Added: |
| observation-precondition | 0..* | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-replaces | 0..* | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| observation-sequelTo | 0..* | Reference | Observation | oo | Trial-Use: FMM3 | Changed: |
| procedure-causedBy | 0..* | Reference | Procedure | pc | Trial-Use: FMM3 | Changed: |
| servicerequest-geneticsItem | 0..* | (complex) | DiagnosticReport | oo | Deprecated: FMM1 | Added: |
| workflow-reason | 0..* | CodeableReference | Observation, DiagnosticReport, DocumentReference, Flag, NutritionOrder | fhir | Trial-Use: FMM2 | n/c |
| workflow-reasonReference | 0..* | Reference | Observation, DiagnosticReport, Media, NutritionOrder | fhir | Deprecated: FMM1 | Added: |
| Extensions that refer to many resources including the Observation resource |
| alternate-reference | 0..1 | Reference | Reference | fhir | Trial-Use: FMM2 | n/c |
| artifact-reference | 0..1 | (Choice) | Element | cds | Trial-Use: FMM1 | Added: |
| cqf-relativeDateTime | 0..1 | (complex) | Element | cds | Deprecated: FMM3 | Changed: |
| diagnosticReport-focus | 0..* | Reference | DiagnosticReport | oo | Experimental
Draft: FMM0 | Changed: |
| event-basedOn | 0..* | Reference | Condition, ChargeItem, ClinicalImpression, Composition, Consent, Coverage,
DetectedIssue, EpisodeOfCare, ExplanationOfBenefit, FamilyMemberHistory,
ImmunizationEvaluation, InventoryReport, MedicationStatement, PaymentNotice,
PaymentReconciliation | fhir | Trial-Use: FMM3 | n/c |
| event-partOf | 0..* | Reference | DiagnosticReport, Condition | fhir | Trial-Use: FMM3 | n/c |
| flag-detail | 0..* | Reference | Flag | pc | Trial-Use: FMM3 | Changed: |
| patient-sexParameterForClinicalUse | 0..* | (complex) | Resource | pa | Experimental
Draft: FMM1 | Changed: |
| replaces | 0..* | canonical | ActivityDefinition, ActorDefinition, CapabilityStatement, ChargeItemDefinition,
Citation, CodeSystem, CompartmentDefinition, ConceptMap, ConditionDefinition,
EventDefinition, Evidence, EvidenceReport, EvidenceVariable, ExampleScenario,
GraphDefinition, ImplementationGuide, Library, Measure, MessageDefinition,
NamingSystem, ObservationDefinition, OperationDefinition, PlanDefinition,
Questionnaire, Requirements, SearchParameter, SpecimenDefinition,
StructureDefinition, StructureMap, SubscriptionTopic, TerminologyCapabilities,
TestScript, ValueSet | fhir | Trial-Use: FMM3 | n/c |
| request-replaces | 0..* | Reference | NutritionOrder, SupplyRequest, Task | fhir | Trial-Use: FMM3 | n/c |
| workflow-barrier | 0..* | CodeableReference | Goal, CommunicationRequest, CarePlan.activity | fhir | Trial-Use: FMM2 | n/c |
| workflow-protectiveFactor | 0..* | CodeableReference | Goal, CommunicationRequest, CarePlan.activity | fhir | Trial-Use: FMM2 | n/c |
| workflow-supportingInfo | 0..* | Reference | DiagnosticReport, DocumentReference, Encounter, Observation, CommunicationRequest | fhir | Trial-Use: FMM3 | n/c |
This table lists search parameters defined for any of the extensions listed above in association with the core specification.
Diagnostic Medicine
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