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SNOMED CT design also includes the Reference Set mechanism which provides a standard way to customize and enhance content for use in a particular  GlossPreSpacefalsetparticular country, language, specialty, application or context. Reference Sets developed nationally or locally can modify search and display of content from the International Edition as well as enhancing Extension content.

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General use cases for subsets represented as Simple Reference Sets

• Excluding content
  
  • For example, the "Non-human Reference Set" excludes content which is only relevant in veterinary medicineReference sets can be used to exclude concepts that are not required by a particular use case.
• Including content
  
  • Limiting searches to content of specific interest to a specialty or specific data entry context
  • In some cases very limited subsets can be presented as dropdown lists or option boxes rather than searches.
• Prioritizing content
  
  • In some cases, a subset represents an initial priority list of options but the full content of SNOMED CT is searchable when required.
  • Note that Ordered Reference Sets support more flexible prioritization.
• Managing use of codes in messages and communications
  • A Simple Reference Set may represent a value set applicable to a particular field in a message.

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