Calculators · Anaesthesiology · Classification
ASA Physical Status classification
Also called ASA grade, ASA PS, ASA class, American Society of Anesthesiologists classification
Pre-anaesthesia comorbidity class I–VI with the ASA-approved adult examples (statement last amended 13 December 2020), plus the "E" emergency modifier.
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Formula and scoring
Class assigned by the anaesthesiologist on the day of anaesthesia. "E" = emergency (delay would significantly increase threat to life or body part). Examples are "including, but not limited to".
Exam and ward pearls
- Normal pregnancy is ASA II; obesity 30–40 is II, BMI ≥ 40 is III (2020 examples).
- MI, stroke, TIA or coronary stent: within 3 months = IV, more than 3 months ago = III.
- ASA VI is reserved for declared brain-dead organ donors.
When not to rely on it
- Assignment is a clinical judgement; the ASA added examples (2014, amended 2020) because they improve correct assignment. Paediatric and obstetric examples differ from the adult ones shown here.
Source
- American Society of Anesthesiologists, Committee on Economics. Statement on ASA Physical Status Classification System. Approved 15 Oct 2014, last amended 13 Dec 2020. Link
Formula and cut-offs checked against these sources on 8 Nov 2026. Educational tool for clinicians; it does not replace clinical judgement.