American Society of Anaesthesiologists Physical Status Score11
| ASA grade | |
| I | A normal healthy patient |
| II | A patient with mild systemic disease |
| III | A patient with severe systemic disease |
| IV | A patient with severe systemic disease that is a constant threat to life |
| V | A moribund patient who is not expected to survive without the operation |
| VI | A declared brain dead patient whose organs are being removed for donor purposes |