ASA (American Society of Anesthesiologists) Physical Status Classification System

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ASA grades

The ASA (American Society of Anesthesiologists) Physical Status Classification System is a simple scale describing fitness to undergo an anaesthetic.

The ASA states that it does not endorse any elaboration of these definitions. However, anaesthetists in the UK often qualify (or interpret) these grades as relating to functional capacity - that is, comorbidity that does not (ASA 2) or that does (ASA 3) limit a person's activity

ASA 1 A normal healthy patient
ASA 2 A patient with mild systemic disease
ASA 3 A patient with severe systemic disease
ASA 4 A patient with severe systemic disease that is a constant threat to life

Reference:

Last reviewed 01/2018

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