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

If the recorded quantity of the specimen is reported as a weight, if it is a dry weight.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/boolean