Even though subsets are typically used to specify content for inclusion, some situations may require particular components to be excluded from another set. Excluding sets of SNOMED CT components can be used to prevent certain concepts appearing in particular search and data entry items.
It is possible to define the subset for exclusion either intensionally or extensionally. The table below shows the types of reference sets that are appropriate to represent subsets for exclusion.
Requirements for excluding content
| Requirement | Reference Set Type |
|---|---|
Exclude concepts from an intensionally defined subset using an extensionally defined subset of exclusion concepts | |
Exclude concepts from an extensionally defined subset using an intensionally defined subset of exclusion concepts Exclude members from an extensionally defined | |
Exclude concepts from an extensionally defined subset using an extensionally defined subset of exclusion concepts | simple reference set |
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