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To decide if a reference set is needed, successful implementers of SNOMED CT must clearly understand their requirements.

Caption reference

CapRefId	requirements
CapRefType	Table

shows The table below shows some typical requirements that may be met using SNOMED CT reference sets. The examples in this table are not exhaustive, but instead illustrate common use cases in which the category of requirement is needed. The T he table also shows the type (or types) of reference set that best meets each requirement. For more information on each requirement category, please click on the diagram to visit the relevant section.

Caption label

CapId	requirements
CapType	Table

Requirements met by reference sets

A subset of components

Link components to web-resources reference setA set of maps or links other code systemsLink concepts to a statistical classification to enable statistical analysis (specification) Reference Set (specification)

A set of sets of components

Simple reference set

Query specification reference set

REQUIREMENTS	EXAMPLE USE CASES	REFERENCE SET
Image Modified	Specify a value set within a specific clinical domain Specify groups of concepts for analytics purposes Specify descriptions used for data entry	Simple reference set
Image Removed An ordered list of components	Prioritize data entry items or search results Specify alternative hierarchies for navigation	Ordered reference set
Image Removed A set of associations between components	Associate inactive components with their replacements Associate components of different types to support consistent and efficient documentation	Association reference set
3.1.1. A Subset of Components	3.2.6.1. Constrain Value Sets 3.2.3.2. Specifying Queries for Retrieval and Analysis 3.2.5.2. Interface Terminology	5.1 Simple Reference Set
Image Added 3.1.2. An Ordered List of Components	3.2.1.4. Order Items for Search and Data Entry 3.2.1.5. Alternative Hierarchical View	Ordered Reference Set
Image Added 3.1.3. A Set of Associations between Components	3.2.6.3.2. Representing Historical Associations 3.2.1.6. Use Case Specific Associations	5.4 Association Reference Set
Image Added 3.1.4. A Set of Components Annotated with Additional Information	3.2.2.1. Linking Concepts to Web Resources	Image Removed A set of components annotated with additional information	Link components to a textual advice	Annotation	Reference Set
Image Modified	3.1.5. A Set of Maps between SNOMED CT and	Another Code System	3.2.3.1. Maps to Statistical Classifications Link concepts to legacy codes and data, to support migration	5.2.9 Simple Map Reference Set	5.2.3.3	Complex and Extended Map	from SNOMED CT Reference Sets
Image Modified	Specify a set of subsets for a particular organisational unit Specify a set of intensionally defined subsets	3.1.6. A Set of Sets of Components	3.2.6.2. Managing Value Sets 3.2.6.2. Managing Value Sets	5.1 Simple Reference Set 5.2. Query Specification Reference Set

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