# Terminology Service Types

This section describes services required to enable effective use of SNOMED CT. The guide does not mandate a particular way to meet these requirements. In some cases, a single terminology service API call may address several of the requirements identified in this section of the guide. In other cases, multiple API calls may be required to address a single requirement.

* [4.1-select-edition-and-version](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.1-select-edition-and-version "mention")
* [4.2-get-a-concept-description-or-relationship](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.2-get-a-concept-description-or-relationship "mention")
* [4.3-get-terms-for-a-concept](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.3-get-terms-for-a-concept "mention")
* [4.4-get-definition-of-a-concept](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.4-get-definition-of-a-concept "mention")
* [4.5-get-and-test-concept-subtypes-and-supertypes](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.5-get-and-test-concept-subtypes-and-supertypes "mention")
* [4.6-get-and-test-reference-set-membership](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.6-get-and-test-reference-set-membership "mention")
* [4.7-validate-and-apply-expression-constraints](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.7-validate-and-apply-expression-constraints "mention")
* [4.8-find-concepts](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.8-find-concepts "mention")
* [4.9-identify-changes-to-the-terminology](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.9-identify-changes-to-the-terminology "mention")
* [4.10-get-data-from-a-reference-set](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.10-get-data-from-a-reference-set "mention")
* [4.11-get-history-data](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.11-get-history-data "mention")
* [4.12-get-mapping-data](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.12-get-mapping-data "mention")
* [4.13-get-concept-model-rules](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.13-get-concept-model-rules "mention")
* [validate-concept-definitions-and-expressions](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/validate-concept-definitions-and-expressions "mention")
* [4.15-test-expression-subsumption](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-terminology-services-guide/4-terminology-service-types/4.15-test-expression-subsumption "mention")

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