APACHE IV ICU Severity Score Calculator

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.