SNOMED CT subsets are an important resource in many implementations. They allow sets of SNOMED components to be grouped together, to support specific use cases, e.g. for data entry of diagnoses for a clinical specialty, for prioritisation of translations, and for data analytics queries. For example, in HL7 FHIR specifications, SNOMED CT value sets are specified in the terminology binding of relevant coded data elements.

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An implementation requirement for SNOMED CT subsets can be satisfied by tools that help users to create generic SNOMED CT subsets, standard RF2 reference sets, or HL7 value sets. The choice of tooling will depend on the implementation artefacts required. For example, a SNOMED CT terminology server may require a SNOMED CT RF2 reference set format.

SNOMED International Reference Set Tool

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This tool is maintained by SNOMED International and is provides a Reference Set and Translation Tool that can be used to maintain Reference Sets and Translations for many national extensions.

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create and maintain SNOMED CT reference sets (see screenshot below).

The features related to Refset Authoring tasks reference sets include:

• Creation of Extensional and Intensional Simple Type Reference Setsextensional and intensional simple type reference sets (of SNOMED CT concepts)
• Addition of reference set members by selecting individual conceptsAdding members by direct selection, by uploading a flat filesfile, or by specifying queriesa query
• Migration of reference sets to a new versioned SNOMED CT editionMaintenance tasks related to the update to new releases of dependencies
• Collaborative workflow for content revisionsreference set authoring and review
• Download and publication of reference setsRefset export for publication
• Management of refset reference set metadata
• Refset Sharing of reference sets via a directory

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Other Subset Tools

Other SNOMED CT subset tools are available, as listed below.

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