APACHE III Mortality Prediction Overview

Overview of the APACHE III (Acute Physiology and Chronic Health Evaluation III) ICU mortality prediction system. Scores 20 physiologic variables during the first 24 hours plus chronic health items and diagnostic category. Score range 0-299. Higher scores correlate with increased predicted hospital mortality, ranging from below 5% at low scores to above 80% at scores above 100.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How to Use

Enter the values for the scenario you are assessing. Overview of the APACHE III (Acute Physiology and Chronic Health Evaluation III) ICU mortality prediction system. Scores 20 physiologic variables during the first 24 hours plus chronic health items and diagnostic category. Score range 0-299. Higher scores correlate with increased predicted hospital mortality, ranging from below 5% at low scores to above 80% at scores above 100. Use the apache iii result to inform your calculation.

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