A characteristic that is always true of a concept.
Notes
- Some necessary conditions can be represented as defining relationships but other necessary conditions that can be represented as OWL axioms cannot be represented as relationships.
- The relationship file represents the inferred view of necessary conditions in that can be represented as relationships.
Example
If you have a 71620000 | fracture of femur| , the morphological abnormality 72704001 | fracture| must be present. Therefore, 116676008 | morphology| = 72704001 | fracture| is a necessary condition of 71620000 | fracture of femur| .
Change Notices
Prior to July 2018, SNOMED CT represented all necessary conditions in the stated view as defining relationships in the stated relationship file.
- Changes introduced in the July 2018 release of the International Edition mean that in future necessary conditions in the stated view will be represented as axioms in the OWL axiom reference set file.
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