APACHE II Score

Estimates ICU mortality.

System of Measurement

Chronic organ insufficiency or immunocompromise history

Yes (+ s/p emergency surgery)

Yes (+ s/p elective surgery)

Yes (but not post-op)

Acute Renal Failure

Yes

Age (years)

Temperature (F) (C)

Mean Arterial Pressure (mm Hg) (mm Hg)

Heart Rate/Pulse (beats per minute)

Respiratory Rate (breaths per minute)

Sodium (mEq/L) (mmol/L)

Potassium (mEq/L) (mmol/L)

Creatinine (mg/dL) (µmol/L)

Hematocrit (%) (%)

White Blood Cell Count (cells/µL) (Ã—10⁹/L)

Glasgow Coma Scale (points) (points)

A-a Gradient (if FiO₂ ≥ 0.5) (mm Hg) (mm Hg)

PaO₂ (if FiO₂ < 0.5) (mm Hg) (kPa)

Interpretation

Source: Knaus WA, Draper EA, Wagner DP, Zimmerman JE. APACHE II: a severity of disease classification system. Crit Care Med. 1985 Oct;13(10):818-29.

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