Reference Sets Practical Guide

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Maps are represented as reference sets, which are either of type simple, complex and extended map reference sets. Special cases may also occur, which require a customized reference set to represent the map. An example of this is the

Concept
t705110001 | LOINC Term to Expression reference set |
, which is used to link LOINC Terms to SNOMED CT expressions. The standard reference set format do not support maps to SNOMED CT expressions. Hence, the type of map reference set to use depends on the features that need to be supported by the map.

Simple map reference sets support mapping SNOMED CT codes to a single code or a combination of codes in a target code system. However simple maps are usually only appropriate where there is an equivalent map between SNOMED CT and the values in the other code system.

Complex and extended map reference sets enable the representation of:

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