MDCalc

APACHE II Score

Estimates ICU mortality.

History of severe organ failure or immunocompromise

Heart Failure Class IV, cirrhosis, chronic lung disease, or dialysis-dependent
years
mm Hg
beats/min
breaths/min

Acute renal failure

Note: "acute renal failure" was not defined in the original study. Use clinical judgment to determine whether patient has acute kidney injury.
%
points

FiO₂

Result:

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Management

The APACHE II score was designed as a mortality prediction tool but was not intended to influence the medical management of patients during their ICU stay.

Critical Actions
  • A number of variables are used to calculate the APACHE II score. The worst values recorded during the initial 24 hours in the ICU should be used. Alternatively, the variables initially recorded during the patient’s admission can be used for practical reasons.
  • The APACHE II score is calculated at the beginning of the ICU admission to help determine the patient’s mortality risk for the admission. It is not calculated sequentially and is not meant to show improvement or effect of interventions. As such it should not be used to direct medical management.
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