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Starter Guide
The best place to start learning about SNOMED CT or to refresh existing knowledge. An overview of a range of topics related to the terminology.

Vendor Introduction to SNOMED CT
An informative practical introduction to SNOMED CT focused primarily on the needs of vendors and developers of EHRs and other related applications in healthcare information technology.

Technical Implementation Guide
Detailed specifications or release files and other IHTSDO standards, accompanied by guidance about various topics related to implementation of SNOMED CT.
National Release Center Guide
The National Release Center Guide (NRC Guide) offers a practical starting point for IHTSDO Member countries. It provides guidance on NRC responsibilities and the relationships between NRCs, IHTSDO, and implementers and users within a Member country. To learn more about SNOMED CT please refer instead to the SNOMED CT Starter Guide.

Frequently Asked Questions
Frequently asked questions about SNOMED CT.
Detailed information about SNOMED CT content development. SNOMED CT CT, hierarchies, defining relationships and content model.
ICD-10 Mapping Specification
The specification for the SNOMED CT to ICD-10 Maps and Guidance on implementation of this specification.

Data Analytics with SNOMED CT
This document reviews current approaches, tools and techniques for performing data analytics using SNOMED CT and to share developing practice in this area. It is anticipated that this report will benefit members, vendors and users of SNOMED CT by promoting a greater awareness of both what has been achieved, and what can be achieved by using SNOMED CT to enhance analytics services.

IHTSDO Glossary
The glossary of terms used in these and other documents about SNOMED CT and IHTSDO.
SNOMED CT Diagramming Guideline
This document describes a diagrammatic notation for representing the definition of a concept, an expression, or relation between expressions within SNOMED CT. See also 'SNOMED CT Diagramming Guideline Templates' on the Tooling Documentation tab of the Document Library.

This document provides a specification for the format and usage of SNOMED CT URIs. Such a URI might identify "A clinical idea to which a unique Concept Identifier has been assigned"1. However, it does not specify or standardise any aspect of the representation of these things. Appropriate representations may vary greatly depending on use-case requirements and services utilising the URIs specified here are free to make their own choices.

SNOMED CT Compositional Grammar Specification and Guide
Revised (May 2015) specification of the SNOMED CT Compositional Grammar used for expressions and definitions. The replaces the specification in the current edition of the Technical Implementation Guides

SNOMED CT Expression Constraint Specification and Guide
Published (September 2015) specification of SNOMED CT Expression Constraints used for represent constraints on the content and structure of an expression. Also used to represent an intensional subset of SNOMED CT concepts. This extends, formalized and replaces earlier informal constraint representations such as those documented in HL7 TermInfo Release 1.

Release Format 2 Value Proposition
Published (March 2013) a guide that explains the value of migrations to SNOMED CT Release Format 2 (RF2) from the 2002 release format (RF1). For additional information on migration from RF1 to RF2 see section 9.2.1 of the Technical Implementation Guide.

Release Format 1 Guide
The specification of the old SNOMED CT release format and guidance on its use. The specification is published for those still using the old format. ** Note RF1 is not longer being maintained or developed as it was replaced by RF2 in 2012 **



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