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A reference set (or 'refset') is a mechanism used to refer to a set of SNOMED CT components and to add customized information to these components. Reference sets can be used for many different purposes, including representing subsets of concepts, descriptions or relationships, language and dialect preferences, maps to and from other code systems, ordered lists, navigation hierarchies and aggregation hierarchies. For more information about the different types of reference sets, please refer to the  Reference Set Release Files Specification.

Reference sets are used for a range of analytics purposes, including: