Table 1 American Society of Anesthesiologists Physical Status (ASA PS) Classification System^a

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