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Table 12 Top areas of eight hierarchies in SNOMED CT (2020-01-31 release)

From: Missing lateral relationships in top-level concepts of an ontology

Hierarchy

# concepts

# Concepts in top area

%

Body structure

39,323

27,224

69.2

Clinical finding

114,397

6427

5.6

Event

3189

3006

94.3

Observable entity

9144

8744

95.6

Pharmaceutical / biologic product

22,244

418

1.9

Procedure

58,154

2628

4.7

Situation with explicit context

4739

61

1.3

Specimen

1702

34

2.0