The American Society of Anesthesiologists (ASA) score is a subjective assessment of a patient’s overall health that is based on five classes (I–V).

I. Patient is a completely healthy fit patient.

II. Patient has mild systemic disease.

III. Patient has severe systemic disease that is not incapacitating.

IV. Patient has incapacitating disease that is a constant threat to life.

V. A moribund patient who is not expected to live 24 hours with or without surgery.

E. Emergency surgery, E is placed after the Roman numeral.