# How to search through entire CodeSystem

**URL:** <https://forum.loinc.org/t/how-to-search-through-entire-codesystem/1036>\
**Category:** loinc-fhir-ts\
**Created:** [November 18, 2019, 2:32pm UTC](https://forum.loinc.org/t/how-to-search-through-entire-codesystem/1036 "2019-11-18T14:32:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![manusisko](https://forum.loinc.org/letter_avatar_proxy/v4/letter/m/d07c76/32.png) [@manusisko](https://forum.loinc.org/u/manusisko)\
**Post date:** [November 18, 2019, 2:32pm UTC](https://forum.loinc.org/t/how-to-search-through-entire-codesystem/1036/1 "2019-11-18T14:32:16Z")

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Hello. I’ve been testing with your terminology server for a couple of days now.

I need to write an HTML form for creating Observations, so I need a source to extract the ‘code’ element, and the resource indicates that the ValueSet includes all the codes in LOINC’s CodeSystem.

My question is: how can I query the entire codesystem, for example using a “$expand?filter=Heart Rate”-like query. I’ve seen I can do this with all the ValueSets available, but I cannot find the ValueSet that contains the entire code system, and my attempts to search through the CodeSystem directly have been futile.

Any help will be appreciated.

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**Author:** ![system](https://forum.loinc.org/uploads/default/original/1X/dbab97ce9b2987d788a376e254fcaae249f3b672.png) [@system](https://forum.loinc.org/u/system)\
**Post date:** [June 23, 2023, 3:36pm UTC](https://forum.loinc.org/t/how-to-search-through-entire-codesystem/1036/2 "2023-06-23T15:36:43Z")

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Closed on June 23, 2023, 3:36pm UTC