| Category | Definition | Mortality rate |
| 1 |
Healthy patient, no medical problems |
0.1 |
| 2 |
The patient has mild systemic disease that does not limit their activities (e.g., controlled hypertension or controlled diabetes without systemic sequellae) |
0.2 |
| 3 |
The patient has moderate or severe systemic disease, which does limit their activities (e.g., stable angina or diabetes with systemic sequellae). |
1.8 |
| 4 |
The patient has severe systemic disease that is a constant potential threat to life (e.g., severe congestive heart failure, end-stage renal failure). |
7.8 |
| 5 |
Moribund, not expected to live 24 hours irrespective of operation |
9.4 |
| E |
Emergency status: In addition to indicating underlying ASA status (1-5), any patient undergoing an emergency procedure is indicated by the suffix "E". For example, a fundamentally healthy patient undergoing an emergency procedure is classified as 1-E. If the patient is undergoing an elective procedure, the "E" designation is not used.
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