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- The scope of various SNOMED CT Editions
Whether the request is permitted given the predefined principles around:
Editorial rules and;
Retaining the Retaining the referential integrity of SNOMED CT
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If the answer to both these questions is "yes", then organization should submit a request to the National Release Center for addition of the required content into the National Edition. If the answer to one or both of these questions is "no", it should be considered for inclusion in a local extension. In situation where the request is considered to be out of scope of SNOMED CT, it may be rejected.
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Considerations relating to appropriateness of content at various levels |
| Relevance of requested content | Description | ||||||||
| Within the scope of the International Edition | If the content requested is within the scope of the International Edition, the organization should request that the content should be added to the International Edition. As SNOMED CT is a global clinical terminology, the scope of the International edition of SNOMED CT is constrained by a set of principles. For inclusion in the International edition, concepts must be
If there is an urgent need for additional content, it may be added to an extension as an interim measure, pending addition to the International Edition. For more information, please refer to Interim content additions below. | ||||||||
| Within the scope of other extension, (National, third-party, or local extension) but outside the scope of the International Edition. | The scope of a national edition may permit the addition of content which falls outside the scope of the International Edition but is required within a country, region or territory. If the content requested is within the scope of a national edition, a request should be submitted to the relevant National Release Center. An organization may also use an extension which was produced by another organization, such as a vendor, regional body or specialist group. In this case, requests for content which fall within the scope of these extensions should be submitted to the relevant extension producer. When there is an urgent need for additional content, it may be added to an extension as an interim measure, pending addition to a national edition or externally maintained extension. For more information, please refer to Interim content additions below. | ||||||||
| Outside the scope of other extensions, but relevant to the organization requesting the content. | An organization which maintains an extension is responsible for defining the scope of that extension. The scope of an extension should not overlap with the scope of the International Edition or any other extension with modules on which the extension modules depend on. Note that urgent content additions may be permitted as an interim measure, even when the content is within the scope of another edition or extension. For more information. please refer to Interim content additions below. Requested content which falls within the defined scope of an extension may be added by the organization which maintains the extension. For additional information about adding local content to an extension, please refer to 5.4 Authoring. | ||||||||
| Outside the scope of SNOMED CT | The request is rejected |
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It is the responsibility of the extension producer to determine which requests are appropriate for their extension vs those which may be appropriate at a higher level. It is therefore important that extension producers are aware of the scope and the editorial principles for the International Edition of SNOMED CT and in some cases a national edition. This will ensure that requests for changes are forwarded to the relevant organization. Furthermore, it is important that extension producers to have an established and reliable process for evaluating, processing, and overall tracking of all change requests received. The process needs to have a routing mechanism to ensure that changes applicable to the extension are made in the extension, and external change requests can be forwarded to the responsible organization, such as SNOMED International.
illustrates the reporting structure for SNOMED International content requests. In general, only NRCs report to SNOMED International directly. Other extension producers will report to SNOMED International indirectly. However in somes cases, an extension producers may submit change requests directly to SNOMED International. For example, if the extension producer is an Affiliate, based in a non-Member territory.Caption reference CapRefId change-request-reporting-structure- CapRefType Figure
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Change request reporting structure |
National Release Centers are responsible for collecting requests for changes detected by Affiliates. Typically requests come from the users or consumers of the extension as they are most familiar with local requirements. Organizations within Member countries can therefore submit their requests for additions and changes to the National Release Center who will make an initial decision about the relevance of the content in the International Edition or the national edition of that country. The NRC may add content to their National Edition if they consider the relevance to be national rather than international. The NRC forwards requests with (what they consider to have) international relevance to SNOMED International for consideration.
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SNOMED International provides the SNOMED CT Content Request Service to gather and process requests for additions and changes to the content of the SNOMED CT International Edition. This service is directly accessible by National Release Centers (NRC) in Member countries and recognized Terminology Authorities within organizations with whom SNOMED International is actively collaborating. Requests that meet inclusion criteria for the International Release are addressed by SNOMED International staff. Some of the reasons behind International content requests are described in
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Reasons for requesting content to be added to the International Edition |
| Example use case | Description |
Gaps in coverage of scope | Clinical meanings that fall within the scope of the International Edition that are not currently represented by concepts in the International Edition |
| Changes in clinical knowledge | Evolving clinical knowledge introduces clinical meanings that require the addition of new SNOMED CT concepts |
| Incomplete definitions | A concept in the International Edition that is missing one or more valid defining relationships |
| Missing synonyms | A concept in the International Edition that is missing one or more widely used synonymous terms |
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