<status value="draft" /> <description value="Social history alcohol 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"> <path value="Observation" /> <constraint> <key value="mert-alcohol-prefer-quantity" /> <severity value="warning" /> <human value="When Alcohol Use is populated, valueQuantity SHOULD be used when available." /> <expression value="value.empty() or value.ofType(Quantity).exists()" /> <source value="https://intrahealth.com/fhir/mert/StructureDefinition/SocialHistoryAlcoholUseMERT" /> </constraint> <constraint> <key value="mert-alcohol-nonquantity-readable" /> <severity value="warning" /> <human value="If value is not a Quantity, it SHOULD be human-readable (string, or CodeableConcept with text or coding)." /> <expression value="value.empty() or value.ofType(Quantity).exists() or value.ofType(string).exists() or (value.ofType(CodeableConcept).text.exists() or value.ofType(CodeableConcept).coding.exists())" /> <source value="https://intrahealth.com/fhir/mert/StructureDefinition/SocialHistoryAlcoholUseMERT" /> </constraint> </element> <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 - Alcohol 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="Alcoholic drinks per day (LOINC 74013-4)" /> <comment value="MERT Alcohol Use uses LOINC 74013-4 (alcoholic drinks per day)." /> <patternCodeableConcept> <coding> <system value="http://loinc.org" /> <code value="74013-4" /> </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 the clinically relevant timing of the alcohol use assessment." /> <mustSupport value="true" /> </element> <element id="Observation.value[x]"> <path value="Observation.value[x]" /> <slicing> <discriminator> <type value="type" /> <path value="$this" /> </discriminator> <ordered value="false" /> <rules value="open" /> </slicing> <type> <code value="Quantity" /> </type> <type> <code value="CodeableConcept" /> </type> <type> <code value="string" /> </type> <mustSupport value="true" /> </element> <element id="Observation.value[x]:valueQuantity"> <path value="Observation.value[x]" /> <sliceName value="valueQuantity" /> <comment value="Preferred representation for LOINC 74013-4 is valueQuantity (drinks per day). Use UCUM when possible (e.g., system http://unitsofmeasure.org and code '/d')." /> <min value="0" /> <max value="1" /> <type> <code value="Quantity" /> </type> <mustSupport value="true" /> </element> <element id="Observation.note"> <path value="Observation.note" /> <comment value="Use note for alcohol-use related comments." /> <mustSupport value="true" /> </element> </differential> </StructureDefinition>