ASA Physical Status (PS) Classification System.
| Preoperative Health Status | Comments | |
|---|---|---|
| ASA 1 | Normal, healthy patient | No organic, physiologic, or psychiatric disturbance, excludes the very young and very old, healthy with good exercise tolerance |
| ASA 2 | Patients with mild systemic disease | No functional limitations; has a well-controlled disease of one body system, controlled hypertension or diabetes without systemic effects, cigarette smoking without COPD, mild obesity, pregnancy |
| ASA 3 | Patients with severe systemic disease | Some functional limitation; has a controlled disease of more than one body system or one major system, no immediate danger of death, controlled congestive heart failure(CHF), stable angina, old heart attack, poorly controlled hypertensions, morbid obesity, chronic renal failure, bronchospastic disease with intermittent symptoms |
| ASA 4 | Patients with severe systemic disease that is a constant threat to life | Has at least one severe disease that is poorly controlled or at end stage, possible risk of death, unstable angina, symptomatic COPD, symptomatic CHF, hepatorenal failure |
| ASA 5 | Moribund patients who are not expected to survive without surgery | Not expected to survive > 24 hours without surgery; imminent risk of death; multiorgan failure, sepsis syndrome with hemodynamic instability, hypothermia, poorly controlled coagulopathy |
| ASA 6 | A declared brain-dead patient whose organs are being removed for donor purposes |