This is the ValueSet that contains all the codes in WHO Type of Covid-19 Test (http://smart.who.int/ddcc/ValueSet/WHODDCCTypeofTestCOVID19) and WHO Type of Covid-19 Test (http://smart.who.int/ddcc/ValueSet/WHODDCCTypeofTestCOVID19). E.g. what you have to deal with if you get resources containing codes in either of them