| Classification | Description |
| ASA 1 | A normal healthy patient. |
| ASA 2 | A patient with mild systemic disease. |
| ASA 3 | A patient with severe systemic disease. |
| ASA 4 | A patient with severe systemic disease that is a constant threat to life. |
| ASA 5 | A moribund patient who is not expected to survive without the operation. |
| ASA 6 | A declared brain-dead patient whose organs are being removed for donor purposes. |
