A characteristic that is always true of a .

Notes

• Some necessary conditions can be represented as  but other necessary conditions that can be represented as OWL axioms cannot be represented as relationships.
• The  represents the  of necessary conditions in that can be represented as relationships.

Example

• If you have a , the morphological abnormality  must be present. Therefore,  is a necessary condition of .

Change Notices

• Prior to July 2018, SNOMED CT represented all necessary conditions in the  as  in the .

• Changes introduced in the July 2018 release of the  mean that in future necessary conditions in the  will be represented as  in the OWL axiom reference set file.

Related Links

• Necessary Conditions