This is the ValueSet that contains all the codes in Lab Test - Type - COVID-19 - LOINC (http://smart.who.int/ddcc/ValueSet/LabTestTypeCovid19LoincValueSet) and Lab Test - Type - COVID-19 - LOINC (http://smart.who.int/ddcc/ValueSet/LabTestTypeCovid19LoincValueSet). E.g. what you have to deal with if you get resources containing codes in either of them