ASA classification (Fitness)

The American Society of Anesthesiologists (ASA) physical status classification system is a system for assessing the fitness of patients before surgery. There are six categories in this classification system. They are:

  • Class I: A normal healthy patient.

  • Class II: A patient with mild systemic disease.

  • Class III: A patient with severe systemic disease.

  • Class IV: A patient with severe systemic disease that is a constant threat to life.

  • Class V: A moribund (in terminal decline; lacking vitality or vigor) patient who is not expected to survive without the operation.

  • Class VI: A declared brain-dead patient whose organs are being removed for donor purposes.

If the surgery is an emergency, the physical status classification is followed by “E” (for emergency) for example “3E”. Class 5 is usually an emergency and is therefore usually "5E". The class "6E" does not exist and is simply recorded as class "6", as all organ retrieval in brain-dead patients is done urgently.
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