http://hl7.org/fhir/StructureDefinition/observation-geneticsInterpretation|5.2.0

Clinical Interpretations for variant. It's a reference to an Observation resource.
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/Observation