http://hl7.org/fhir/StructureDefinition/specimen-sequenceNumber|5.2.0

An assigned number on the specimen denoting the order of collection.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/integer