> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/s/snomed-ct-release-format-1.md).

# snomed ct release format 1

## SNOMED CT Release Format 1

The file structure previously used to distribute SNOMED CT content.

#### Notes

* *Release Format 1* was specified by SNOMED International in 2002, but was replaced by Release Format 2 in January 2012.
* Release Format 2 is now the primary format for the SNOMED CT International Release.
* During an overlap period until 2016, both formats were used for the SNOMED CT International Release.

## Alternatives

* **RF1**
* **Release Format 1**

##

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