Current Version - Under Revision
Example use cases:
Retrieve the specified Concept Identifier
This kind of selective data retrieval can be easily implemented using SQL, Concept Identifiersare the primary key or foreign keys in all the necessary tables in the SNOMED CTmodel. Retrieval of descendantscan be optimized as detailed in the "Optimizing concept subsumption testing chapter.
Implementations based primarily on precoordinatedcontent will be able to support most of their use cases with this kind of query. SNOMED CTcontent is distributed with a pre-computed inferred view, that can be trusted to retrieve all related conceptsby references to a conceptin the terminology.
Implementations that have created local extensions, will require the availability of a DescriptionsLogic classifier in order to periodically compute a new inferred view that will discover new relationshipsbetween conceptsin the terminology.
In use cases where clinical data is recorded as postcoordinated expressions, or where postcoordinated expressionsare used as the query, the techniques described in the Expression retrieval section should be applied.