This is the ValueSet that contains all the codes in eHDSI Reference Range Applies To (http://terminology.ehdsi.eu/ValueSet/eHDSIReferenceRangeAppliesTo) and eHDSI Reference Range Applies To (http://terminology.ehdsi.eu/ValueSet/eHDSIReferenceRangeAppliesTo). E.g. what you have to deal with if you get resources containing codes in either of them