APACHE IV ICU Severity Score Calculator

Age years

Heart rate beats per minute

Mean arterial pressure mmHg

Temperature degrees Celsius

Respiratory rate breaths per minute

PaO2 mmHg

FiO2 fraction as decimal

Arterial pH

Sodium mmol per liter

Potassium mmol per liter

Creatinine mg per dL

Hematocrit percent

White blood cell count 10^3 per mm3

Glasgow Coma Scale total

Mechanical ventilation on ICU day one

Emergency surgery at admission

Chronic health points present

APACHE IV calculation note
APACHE IV is a validated severity scoring system published for hospital mortality assessment in critically ill adults. The original model uses many physiologic variables combined with spline terms and coefficients derived from a very large multicenter dataset. Reproducing the exact predicted mortality requires the original model coefficients or authorized software. This tool collects the day one variables required to compute APACHE IV and displays them for clinical review. If you have access to an authorized coefficient set or a validated API we can incorporate the exact calculation here to return a predicted hospital mortality and expected length of stay.

References
Zimmerman JE et al. Acute Physiology and Chronic Health Evaluation IV hospital mortality assessment for todays critically ill patients. Critical Care Medicine. 2006 May;34 5 1297 1310. doi 10.1097/01.CCM.0000215112.84523.F0.
Available public summaries and validation studies provide further guidance on model use and limitations in local populations. See the APACHE IV manuscript and related validation literature for detailed model specification and implementation guidance.

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