<status value="draft" /> <description value="Social history tobacco use observation for MERT exchange." /> <fhirVersion value="4.0.1" /> <kind value="resource" /> <abstract value="false" /> <type value="Observation" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" /> <derivation value="constraint" /> <differential> <element id="Observation.status"> <path value="Observation.status" /> <short value="'final' only" /> <comment value="For MERT, only Observation.status = 'final' is processed." /> <patternCode value="final" /> <mustSupport value="true" /> </element> <element id="Observation.category"> <path value="Observation.category" /> <short value="social-history" /> <comment value="Exactly one category is used in Social History - Tobacco Use for MERT, and it SHALL be social-history." /> <min value="1" /> <max value="1" /> <patternCodeableConcept> <coding> <system value="http://terminology.hl7.org/CodeSystem/observation-category" /> <code value="social-history" /> </coding> </patternCodeableConcept> <mustSupport value="true" /> </element> <element id="Observation.code"> <path value="Observation.code" /> <short value="Tobacco smoking status (LOINC 72166-2)" /> <comment value="MERT Tobacco Use uses LOINC 72166-2." /> <patternCodeableConcept> <coding> <system value="http://loinc.org" /> <code value="72166-2" /> </coding> </patternCodeableConcept> <mustSupport value="true" /> </element> <element id="Observation.subject"> <path value="Observation.subject" /> <min value="1" /> <type> <code value="Reference" /> <targetProfile value="https://intrahealth.com/fhir/mert/StructureDefinition/PatientMERT" /> </type> <mustSupport value="true" /> </element> <element id="Observation.effective[x]"> <path value="Observation.effective[x]" /> <comment value="Use effective[x] when available to indicate clinically relevant timing (e.g., when smoking started)." /> <mustSupport value="true" /> </element> <element id="Observation.value[x]"> <path value="Observation.value[x]" /> <type> <code value="CodeableConcept" /> </type> <mustSupport value="true" /> <binding> <strength value="required" /> <valueSet value="http://hl7.org/fhir/ValueSet/observation-smokingstatus" /> </binding> </element> <element id="Observation.value[x].text"> <path value="Observation.value[x].text" /> <mustSupport value="true" /> </element> <element id="Observation.note"> <path value="Observation.note" /> <comment value="Use note for tobacco-use related comments." /> <mustSupport value="true" /> </element> </differential> </StructureDefinition>