# reference set membership test

## reference set membership test

A test to determine whether a specified SNOMED CT component is a member of a specified reference set.

#### Notes

* A *component* is a member of a *reference set* if at least one active row in that *reference set* has a referenceComponentId "Reference term: referenceComponentId (field)") that matches the \_\_ identifier of that *component*. Otherwise, a *component* is not a member of that *reference set*.
* *Reference set membership tests* may be used to filter searches or as part of a expression constraint or query.
* In an *expression constraint* a *reference set membership test* is represented by the symbol\*\* *^*\*\* followed by a concept id identifying the *reference set*.

##

<a href="https://docs.google.com/forms/d/e/1FAIpQLScTmbZIf0UEQwYDkY27EEWBkaiYkHSbR0_9DmFrMLXoQLyL7Q/viewform?usp=pp_url&#x26;entry.1767247133=SNOMED+Glossary&#x26;entry.670899847=reference%20set%20membership%20test" class="button primary">Provide Feedback</a>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/r/reference-set-membership-test.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.