Table 3.

Examples of the equivalence rating.

Degree of equivalence (ISO/TR 12300)	Source (NKDUCa)	Target
		SNOMED CTb (descriptor)	(SCTIDc)
Equivalence of meaning; lexical, as well as conceptual	Ankle-brachial pressure index	Ankle-brachial pressure index (observable entity)	446841001
Equivalence of meaning, but with synonymy	Ulcus cruris arteriosum	Arteritic leg ulcer (disorder)	402862000
Source concept is broader and has a less specific meaning than the target concept	Skin condition	Periwound skin condition (observable entity)	700149001
Source concept is narrower and has a more specific meaning than the target concept	Wound infection	Infection status (observable entity)	405009004
No map is possible	Extent of wound area	N/Ad	N/A

^aNKDUC: National Consensus for the Documentation of Leg Wounds.

^bSNOMED CT: Systematized Nomenclature of Medicine–Clinical Terms.

^cSCTID: Systematized Nomenclature of Medicine–Clinical Terms Identifier.

^dN/A: not applicable.