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APACHE II Score

Severity-of-disease classification for adult ICU patients, from 12 physiologic variables plus age and chronic health status, within the first 24 hours of admission.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

Temperature (worst value in 24h)

Mean Arterial Pressure

Heart Rate

Respiratory Rate

FiO₂ ≥ 0.5? (determines which oxygenation table applies)

Oxygenation — A-a gradient (only if FiO₂ ≥ 0.5)

Oxygenation — PaO₂ (only if FiO₂ < 0.5)

Arterial pH

Serum Sodium

Serum Potassium

Serum Creatinine

Acute renal failure present? (doubles the creatinine points)

Hematocrit

White Blood Cell Count (×10³/mm³)

Glasgow Coma Scale (actual score, 3–15)

Ageyears

Severe organ insufficiency or immunocompromised

Enter the values above to see the result.

Source

Knaus WA, Draper EA, Wagner DP, Zimmerman JE. APACHE II: a severity of disease classification system. Crit Care Med. 1985;13(10):818-829.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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