<status value="draft" /> <date value="2026-06-23" /> <publisher value="NHS England" /> <description value="Derived profile from UKCore-Observation for NHS Health Check Online. Enforces status=final and requires one of: value[x], dataAbsentReason, component, or hasMember. Supports vital signs, labs, social history, and physical activity observations." /> <fhirVersion value="4.0.1" /> <kind value="resource" /> <abstract value="false" /> <type value="Observation" /> <baseDefinition value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-Observation" /> <derivation value="constraint" /> <differential> <element id="Observation"> <path value="Observation" /> <constraint> <key value="nhshc-obs-1" /> <severity value="error" /> <human value="At least one of value[x], dataAbsentReason, component, or hasMember must be present." /> <expression value="value.exists() or dataAbsentReason.exists() or component.exists() or hasMember.exists()" /> </constraint> </element> <element id="Observation.status"> <path value="Observation.status" /> <min value="1" /> <fixedCode value="final" /> </element> <element id="Observation.category"> <path value="Observation.category" /> <min value="1" /> </element> <element id="Observation.code"> <path value="Observation.code" /> <min value="1" /> <binding> <strength value="extensible" /> <valueSet value="http://hl7.org/fhir/ValueSet/observation-codes" /> </binding> </element> <element id="Observation.subject"> <path value="Observation.subject" /> <min value="1" /> <type> <code value="Reference" /> <targetProfile value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-Patient" /> </type> </element> <element id="Observation.encounter"> <path value="Observation.encounter" /> <min value="1" /> <type> <code value="Reference" /> <targetProfile value="https://fhir.nhs.uk/StructureDefinition/NHSHC-Encounter" /> </type> </element> <element id="Observation.effective[x]"> <path value="Observation.effective[x]" /> <min value="1" /> </element> <element id="Observation.performer"> <path value="Observation.performer" /> <min value="1" /> <type> <code value="Reference" /> <targetProfile value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-Organization" /> <targetProfile value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-Practitioner" /> </type> </element> </differential> </StructureDefinition>