The American Society of Anaesthesiologist (ASA) Physical Status Classification 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 to survive without the operation ASA 6 A declared brained-dead patient whose organs are being removed for donor purposes