ASA Physical Status

Pre-operative risk classification

Select the class that best fits the patient

I — Normal healthy patient

II — Mild systemic disease

III — Severe systemic disease

IV — Severe systemic disease, constant threat to life

V — Moribund, not expected to survive without surgery

VI — Declared brain-dead, organ donor

Evidence

Original publication

American Society of Anesthesiologists. ASA Physical Status Classification System.

ASA House of Delegates, 2020

Open source

Validation

Sankar A, Johnson SR, Beattie WS, Tait G, Wijeysundera DN. Reliability of the American Society of Anesthesiologists physical status scale in clinical practice. Inter-rater agreement was moderate (kappa ~0.6); ASA class is a subjective assessment, not a validated predictive score.

British Journal of Anaesthesia, 2014

Open source

Last reviewed: 2026-09

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