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Simple reference set

Allows a set of components to be specified for inclusion or exclusion for a specified purpose

Constrain values available in clinical data entry templates. (E.g. define pick lists, constrain searches etc.)
Specify values accepted for communication purposes in specific elements in a communication message

Ordered reference set

Allows a collection of components to be defined with a specified given a priority ordering

Alternative navigation hierarchies. Specify a preferred order of concepts/descriptions in pick lists

Attribute value reference set

Allows a value from a specified range to be associated with a component

This reference set type can be used for many different purposes that are related to both content and technical use cases. E.g. to specify why a concept or description has been inactivated

Simple map reference set

Allows representation of simple maps between SNOMED CT concepts and values in other code systems.

Appropriate where there is a close "one-to-one" mapping between SNOMED CT concepts and coded values in another code system.

Complex and Extended Map reference sets

Allows representation of simple complex maps between SNOMED CT concepts and values in other code systems

Enables representation of maps where each SNOMED CT concept may map to one or more codes in a target scheme, or where the correlation of each map should be specified

Language reference set

Supports the representation of language and dialects preferences for the use of particular descriptions

Used to specify the acceptable and preferred terms for use within a particular country or region. Can also be used to represent preferences for use of descriptions in a more specific context such as a clinical specialty, organization or department

Query specification reference set

Allows a serialized query to represent the membership of a subset of SNOMED CT components

Used to represent Intentional definitions of reference sets. Constrain values available in clinical data entry templates, as part of a terminology binding

Annotation reference set

Allows text strings to be associated with components for any specified purpose

E.g. linking a SNOMED CT component to a url, e.g. for linking to a clinical guideline

Association reference set

Represents a set of unordered associations of a particular type between components

Used to associate inactive concepts with active concepts that can serve as potential replacements for the inactivated concepts

Module dependency reference set

Represents dependencies between different SNOMED CT release modules

The Module Dependency reference set is used to ensure that all dependencies are satisfied when importing data

Description format reference set

Specifies the text format and maximum length of each supported description type

Specify new, localized description formats to be used in an Extension

Reference set descriptor reference set

Represents the format of all reference sets included in a particular release

Specify new, customized reference set formats to be used in an Extension