http://hl7.org/fhir/StructureDefinition/diagnosticReport-focus|5.2.0

States what the diagnostic report is about if it is not the subject of the report
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/Reference
Extension.value[x].targetProfilehttp://hl7.org/fhir/StructureDefinition/Resource