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These subsets types can be created by many methods, but here are a few commonly used used:
- Manual inclusion, using search and browse methods
- An existing subset, used as a starting point for further manual inclusion and update
- Lexical queries, to identify candidate members, followed by manual verification and update
- Hierarchical queries, to identify descendants of a given concept (e.g. descendants of <73211009 |diabetes mellitus|)
- Attribute queries, to identify concepts with a specific attribute value (e.g. disorders with a finding site of 80891009 |heart structure|
- SNOMED CT queries, using the SNOMED CT Expression Constraint or Query languages, which offer additional query functionality.
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Please refer to the Naming convention for pan-Canadian Reference sets and Value sets.pdf document for detailed rules for consistent naming of pan-Canadian reference sets and value sets.