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    APACHE II Score

    Estimates ICU mortality.
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    When to Use
    Pearls/Pitfalls
    Why Use
    years
    F
    mm Hg
    beats/min
    breaths/min
    mEq/L
    mEq/L
    mg/dL
    %
    ×10³/µL
    Use either A-a Gradient OR PaO2
    mm Hg
    mm Hg
    About the Creator
    Dr. William Knaus
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    Evidence
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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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