<status value="draft" /> <description value="MERT vital signs Observation. Restricted to a small set of LOINC codes, with special handling for blood pressure panel." /> <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-vitals-bp-panel-structure" /> <severity value="error" /> <human value="If code is blood pressure panel (LOINC 85354-9), Observation.value SHALL be absent and at least one component (systolic and/or diastolic) SHALL be present." /> <expression value="code.coding.where(system='http://loinc.org' and code='85354-9').empty() or (value.empty() and component.where(code.coding.where(system='http://loinc.org' and (code='8480-6' or code='8462-4')).exists()).exists())" /> <source value="https://intrahealth.com/fhir/mert/StructureDefinition/ObservationVitalsMERT" /> </constraint> <constraint> <key value="mert-vitals-nonbp-requires-quantity" /> <severity value="error" /> <human value="If code is not blood pressure panel (LOINC 85354-9), Observation.valueQuantity SHALL be present." /> <expression value="code.coding.where(system='http://loinc.org' and code='85354-9').exists() or value.ofType(Quantity).exists()" /> <source value="https://intrahealth.com/fhir/mert/StructureDefinition/ObservationVitalsMERT" /> </constraint> </element> <element id="Observation.status"> <path value="Observation.status" /> <comment value="MERT transmits vitals as final observations." /> <patternCode value="final" /> <mustSupport value="true" /> </element> <element id="Observation.category"> <path value="Observation.category" /> <comment value="MERT uses the vital-signs category." /> <min value="1" /> <max value="1" /> <mustSupport value="true" /> </element> <element id="Observation.category.coding"> <path value="Observation.category.coding" /> <min value="1" /> <mustSupport value="true" /> </element> <element id="Observation.category.coding.system"> <path value="Observation.category.coding.system" /> <min value="1" /> <patternUri value="http://terminology.hl7.org/CodeSystem/observation-category" /> </element> <element id="Observation.category.coding.code"> <path value="Observation.category.coding.code" /> <min value="1" /> <patternCode value="vital-signs" /> </element> <element id="Observation.code"> <path value="Observation.code" /> <comment value="Only the MERT-supported vital sign LOINC codes are permitted." /> <mustSupport value="true" /> <binding> <strength value="required" /> <valueSet value="https://intrahealth.com/fhir/mert/ValueSet/mert-vitals-code-vs" /> </binding> </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.encounter"> <path value="Observation.encounter" /> <mustSupport value="true" /> </element> <element id="Observation.effective[x]"> <path value="Observation.effective[x]" /> <mustSupport value="true" /> </element> <element id="Observation.value[x]"> <path value="Observation.value[x]" /> <slicing> <discriminator> <type value="type" /> <path value="$this" /> </discriminator> <ordered value="false" /> <rules value="open" /> </slicing> <comment value="For non-blood-pressure vitals, valueQuantity is required. For BP panel (85354-9), value is absent and components carry the values." /> <mustSupport value="true" /> </element> <element id="Observation.value[x]:valueQuantity"> <path value="Observation.value[x]" /> <sliceName value="valueQuantity" /> <comment value="For BMI (LOINC 39156-5), represent the result as valueQuantity in kg/m2." /> <min value="0" /> <max value="1" /> <type> <code value="Quantity" /> </type> <mustSupport value="true" /> </element> <element id="Observation.note"> <path value="Observation.note" /> <mustSupport value="true" /> </element> <element id="Observation.hasMember"> <path value="Observation.hasMember" /> <mustSupport value="true" /> </element> <element id="Observation.component"> <path value="Observation.component" /> <comment value="Used for blood pressure panel (LOINC 85354-9) to carry systolic/diastolic components. Other vitals generally have no components." /> <mustSupport value="true" /> </element> <element id="Observation.component.code"> <path value="Observation.component.code" /> <mustSupport value="true" /> <binding> <strength value="required" /> <valueSet value="https://intrahealth.com/fhir/mert/ValueSet/mert-bp-component-code-vs" /> </binding> </element> <element id="Observation.component.value[x]"> <path value="Observation.component.value[x]" /> <slicing> <discriminator> <type value="type" /> <path value="$this" /> </discriminator> <ordered value="false" /> <rules value="open" /> </slicing> <mustSupport value="true" /> </element> <element id="Observation.component.value[x]:valueQuantity"> <path value="Observation.component.value[x]" /> <sliceName value="valueQuantity" /> <min value="0" /> <max value="1" /> <type> <code value="Quantity" /> </type> <mustSupport value="true" /> </element> </differential> </StructureDefinition>