This is the ValueSet that contains all the codes in Results Specimen Type - IPS (http://hl7.org/fhir/uv/ips/ValueSet/results-specimen-type-uv-ips) and Materiál vzorků (https://ncez.mzcr.cz/terminology/ValueSet/lab-specimenType). E.g. what you have to deal with if you get resources containing codes in either of them