American Society of Anesthesiologists (ASA) physical status classification system:
- A normal healthy patient.
- A patient with mild systemic disease.
- A patient with severe, but not incapacitating, systemic disease.
- A patient with severe systemic disease that is a constant threat to life.
- A moribund patient who is not expected to live beyond 24 hours.
- A declared brain-dead patient whose organs are being removed for donor purposes.