Table 2 American Society of Anaesthesiologists (ASA) score

Class 1:

→ Patient in apparent good health notwithstanding his surgical problem

→ Limitations on activity: none

→ Limitations on activity: none

→ Excluded: persons at extremes of age (very young, very old)

Class 2:

→ Patient with mild systemic disease (e.g., mild hypertension, mild-moderate anaemia)

→ Patient’s health: disease of one body system

→ Status of underlying disease: well controlled

→ Limitations on activity: none

→ Danger of death: none

Class 3:

→ Patient with systemic disease severe enough to limit activity but not incapacitating

→  Patient’s health: disease of more than one body system or one major system

→ Limitations on activity: present but not incapacitated

→ Danger of death: no immediate danger

Class 4:

→ Patient with severe incapacitating disease that is a constant threat to life

→ Patient’s health: poor, with at least one severe disease

→ Status of underlying disease: poorly controlled or end-stage

→ Limitations on activity: incapacitated

→ Danger of death: possible

Class 5:

→ Moribund patient not expected to survive 24 h with or without surgery

→ Patient’s health: very poor, moribund

→ Limitations on activity: incapacitated

→ Danger of death: imminent

Class 6:

→ A declared brain-dead patient whose organs are being removed for donor purposes