Nature of Service/Test/Observation

Relation/CHD: Atomic service/test/observation (test code or treatment code)
Single observation calculated via a rule or formula from other independent observations (e.g., Alveolar--arterial ratio, cardiac output)
Functional procedure that may consist of one or more interrelated measures (e.g., glucose tolerance test, creatinine clearance), usually done at different times and/or on different specimens
Profile or battery consisting of many independent atomic observations (e.g., SMA12, electrolytes), usually done at one instrument on one specimen
Superset--a set of batteries or procedures ordered under a single code unit but processed as separate batteries (e.g., routines = CBC, UA, electrolytes)