SNOMED Documentation Search
A core responsibility of an NRC is to make the International Edition of SNOMED CT and/or the National Extension of SNOMED CT available for Affiliates.
Every NRC must therefore be able to provide guidance on access to SNOMED CT, version control and management. Moreover, the NRC should be able to provide guidance to users on specific terminology services that are provided by the NRC, and in the use of national SNOMED CT developments, such as National Extensions, Reference sets, etc.
IHTSDO maintains and delivers shared content and derivatives
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A SNOMED CT Derivative is a document, subset, set of maps, or other resource that consists of, includes, references or is derived from one or more SNOMED CT components. The standard computer processable representation for most types of SNOMED CT derivatives is a Reference set. |
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Members of IHTSDO and Affiliates outside of Member countries, both access the release files via IHTSDO's SNOMED CT Licensing and Distribution Services (MLDS).
All files distributed to Members are available from the "SNOMED CT International Edition" product page on MLDS, and can be accessed here: https://mlds.ihtsdotools.org/#/ihtsdoReleases/ihtsdoRelease/167
Access and information about MLDS can be found here: https://mlds.ihtsdotools.org
IHTSDO has provided a guide on how to use SNOMED CT release files, and that guide is useful to gain knowledge on the content of the SNOMED CT release files and an understanding of how the data in the release files support the many uses of SNOMED CT.
Guidance on how to use SNOMED CT release files can be found in the Technical Implementation Guide http://snomed.org/tig
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IHTSDO provides regular updates to the SNOMED CT International Edition. SNOMED CT is released
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Approximately two months before each new public release of the SNOMED CT International Edition, a Beta Release is made available to IHTSDO Members (NRCs). Although IHTSDO completes a thorough quality assurance (QA) process on each International Release, the Beta Release provides an opportunity for key stakeholders to perform independent QA on the files and provide feedback to IHTSDO prior to distribution of the final release. NRCs are expected to provide a written report on any issues encountered, to which IHTSDO will formally respond.
The Beta Release is only for QA use by Members. It should not be distributed to Affiliate Licensees or any other third parties without the permission of IHTSDO.
Examples of technical quality assurance tests applied to SNOMED CT releases:
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While IHTSDO undertakes these tests, an NRC may choose to replicate them or extend some of these tests in their own technical environments to provide additional quality assurance.
Regular changes to SNOMED CT are necessary in order to satisfy user needs and requirements and to improve the quality of SNOMED CT itself. An NRC must be aware that any change to SNOMED CT may have impact on National Extensions and guidance. Therefore, every release requires reconciliation to ensure that all National Extensions remain aligned with the International Edition. To accommodate this need for reconciliation, Members gain access to each International Release one month before the public release of the SNOMED CT International Edition. The purpose of this Members' release is to allow the NRCs to reconcile their national developments according to the new International Edition prior to the public release.
If SNOMED CT components (concepts, descriptions or relationships) are added or inactivated, an assessment of how these changes affect a National Extension is be required, and adjustments to the national developments may be needed. For example:
With every SNOMED CT release three different release file types are made available:
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The International Edition is provided in all three release types. However, as the Snapshot and the Delta can be generated from the Full Release, the specification only requires that organizations that maintain Extensions provide a Full Release of their extension.
Guidance on import of the different release types can be found in the following section of Technical Implementation Guide: http://snomed.org/tig
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