description: Specimen focus, Extension to represent the entity from which the specimen is collected when it is not the subject of record. package_name: hl7.fhir.eu.laboratory derivation: constraint name: SpecimenFocus type: Extension elements: extension: {index: 0} url: pattern: {type: Uri, value: 'http://hl7.eu/fhir/laboratory/StructureDefinition/specimen-focus'} index: 1 value: choices: [valueReference] index: 3 valueReference: type: Reference choiceOf: value refers: ['http://hl7.org/fhir/StructureDefinition/Device', 'http://hl7.org/fhir/StructureDefinition/Group', 'http://hl7.org/fhir/StructureDefinition/Location', 'http://hl7.org/fhir/StructureDefinition/RelatedPerson', 'http://hl7.org/fhir/StructureDefinition/Substance'] index: 4 package_version: 2.0.0 extensions: {} class: extension kind: complex-type url: http://hl7.eu/fhir/laboratory/StructureDefinition/specimen-focus base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0