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This section addresses the types of terminology servicethat are required to enable effective use of the SNOMED CThierarchies and definitions when retrieving data.

The actual process of data retrieval is a record service, rather than a terminology servicebecause it involves interactions with a database containing instance data (e.g. an electronic health recordor data warehouse repository). However, queries may use predicates that specify subtypesof particular conceptsor specify conceptsthat have particular defining Relationships. In order to resolve these queries, the application will need to provide or use Terminology services, adapted to the implementation model in use. The use of either a local extension with a "Managed content addition" strategy, or postcoordinated expressionsstrategy with an expressionsreference table, has an effect on the required set of Terminology services.

See also

Data Analytics with SNOMED CT