This is the ValueSet that contains all the codes in Lab Test - Sample Origin - ICAO (http://smart.who.int/ddcc/ValueSet/lab-test-sample-origin-icao) and Lab Test - Sample Origin - ICAO (http://smart.who.int/ddcc/ValueSet/lab-test-sample-origin-icao). E.g. what you have to deal with if you get resources containing codes in either of them