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APACHE II Score

Worst values in first 24 h of ICU admission: 12 acute physiology scores + age + chronic health.

Rechner

Use rectal/core temperature (C), MAP (mmHg), PaO2 (mmHg), FiO2 (0.21-1.0). If FiO2 >=0.5, enter PaCO2 for A-a gradient. WBC in x10^9/L.

Age (years)

Temperature (C)

Mean arterial pressure (mmHg)

Heart rate (/min)

Respiratory rate (/min)

FiO2 (fraction)

PaO2 (mmHg)

PaCO2 (mmHg)

Arterial pH

Serum sodium (mEq/L)

Serum potassium (mEq/L)

Serum creatinine (mg/dL)

Hematocrit (%)

WBC (x10^9/L)

Glasgow Coma Scale (3-15)

Chronic health points

Acute renal failure (doubles creatinine points when Cr >=1.5 mg/dL)

APACHE II

How it works

APACHE II sums acute physiology score, age points, and chronic health points from the worst values in the first 24 hours after ICU admission.

Limits

Does not replace clinician judgment, diagnosis-specific scores, or APACHE IV. Teaching implementation-verify against institutional tools.

Educational tool only-not for diagnosis or treatment decisions.

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