Purpose

Relationships may be added in an extension for various reasons including:

• Specifying the defining characteristics of new extension concepts
• Improving the definition of an existing extension concept
• In exceptional cases, it may be permissible to add defining relationships to
  • Concepts which belong to the International Edition
  • Concepts which belong to another module on which the extension depends

Principles

Overview

A SNOMED CT relationship involves three main concepts - the source concept, the destination concept, and the relationship type concept (also known as the 'attribute'). Each of the concepts in an extension relationship may belong to either a module from the extension itself, or a module upon which the extension depends (e.g. an international module).

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Process

The table below provides a summary of the process to follow when adding a new relationship to an extension.

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