Anesthesiology

ASA Physical Status Classification

Stratifies preoperative systemic health status and perioperative mortality risk.

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Parameters

ASA Physical Status Classification Result

Formula

Standardized 6-tier pre-anesthetic classification defined by the American Society of Anesthesiologists (with optional "E" emergency modifier).

Clinical Pearls

Universally required on every surgical and anesthetic chart globally to categorize baseline patient physiological reserve prior to sedation or general anesthesia.

Limitations

Qualitative scoring system; should be combined with procedure-specific surgical risk indices (e.g. NSQIP, Revised Cardiac Risk Index / RCRI).