| ASA score | Physical status |
| 1 | A normal healthy patient |
| 2 | A patient with a mild systemic disease |
| 3 | A patient with a severe systemic disease that limits activity but is not incapacitating |
| 4 | A patient with an incapacitating systemic disease that is a constant threat to live |
| 5 | A moribund patient not expected to survive 24 hours with or without operation |