ASA Classification

Standardized classification of preoperative patient health status for anesthetic risk

Indication

Standardized classification of preoperative patient health status for anesthetic risk

id: asa_class; label: ASA Class; type: options; options: label: I — Normal healthy patient; value: 1; label: II — Mild systemic disease (well-controlled HTN, DM, mild obesity); value: 2; label: III — Severe systemic disease (poorly controlled DM, ESRD on dialysis, COPD); value: 3; label: IV — Severe systemic disease that is a constant threat to life (recent MI, sepsis, DIC); value: 4; label: V — Moribund patient not expected to survive without surgery; value: 5; label: VI — Brain-dead organ donor; value: 6

function(score) { var data = [ { tier: 'ASA I', action: 'Healthy patient. Very low anesthetic risk.', color: 'green' }, { tier: 'ASA II', action: 'Mild systemic disease. Low anesthetic risk.', color: 'green' }, { tier: 'ASA III', action: 'Severe systemic disease. Moderate anesthetic risk. Increased perioperative morbidity.', color: 'yellow' }, { tier: 'ASA IV', action: 'Life-threatening disease. High anesthetic risk. Consider ICU postop.', color: 'red' }, { tier: 'ASA V', action: 'Moribund. Not expected to survive without surgery. Highest risk.', color: 'red' }, { tier: 'ASA VI', action: 'Brain-dead organ donor.', color: 'red' }, ]; var idx = Math.min(score - 1, 5); return { risk: 'ASA ' + score, tier: data[idx].tier, action: data[idx].action, color: data[idx].color }; }

ASA class correlates with perioperative mortality but was not designed as a risk predictor
Add "E" for emergency surgery — e.g., ASA IIIE
Pregnancy itself does not affect ASA class — classify based on comorbidities

ASA Physical Status Classification System, American Society of Anesthesiologists. Last reviewed: 2024-11-01