This is the ValueSet that contains all the codes in hl7VS-specimenType (http://terminology.hl7.org/ValueSet/v2-0487) and Specimen type (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1099.54). E.g. what you have to deal with if you get resources containing codes in either of them