# value set

## value set

A uniquely identifiable set of valid concept representations, where any concept representation can be tested to determine whether or not it is a member of the *value set*.

#### Notes

* This definition is used in HL7 Vocabulary Committee documents and FHIR specifications.
* The role of a *value set* is to constrain the permissible content for a particular use (e.g. data entry into a particular field).
* In SNOMED CT a concept representation may be a concept identifier or a SNOMED CT expression.
* A reference set can be used to represent a *value set* of SNOMED CT concepts each of which is represented by a concept identifier in the *referencedComponentId* field.

## Related Links

* [Full HL7 definition of Value Set](http://www.hl7.org/documentcenter/public_temp_EAB8B159-1C23-BA17-0C9D6BEF9E7445FD/standards/V3/core_principles/infrastructure/coreprinciples/v3modelcoreprinciples.html#coreP_Coded_Properties-value-sets)

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