APS points = 15 − GCS
⚕️ For clinical reference only. Not a substitute for professional judgment.
APACHE II Score ICU
Acute Physiology and Chronic Health Evaluation II — predicts ICU mortality using worst values in first 24 hours.
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Select parameters
Complete all sections to calculate predicted mortality.
Acute Physiology Score (APS)
Age Points
Chronic Health Points
When to use
- ICU admission — use worst values in first 24 hours
- Comparing patient acuity and benchmarking outcomes
- Research and quality improvement in critical care
- Not designed for serial monitoring — use SOFA for that
Formula
APACHE II = APS (12 variables) + Age points + Chronic health points
Range: 0–71
Mortality rises from ~4% (score 0–4) to >85% (score ≥35)
References
- Knaus WA et al. APACHE II: a severity of disease classification system. Crit Care Med. 1985.