How to Calculate APACHE II Score
What is APACHE II Score?
APACHE II score predicts intensive care mortality based on 12 physiologic variables and chronic health. Higher scores indicate worse prognosis.
Step-by-Step Guide
- 1Score 12 variables: heart rate, mean BP, temperature, respiratory rate, oxygenation, pH, sodium, potassium, creatinine, hematocrit, WBC, Glasgow Coma
- 2Add age score and chronic health points
- 3Total 0-71; higher indicates mortality risk
Worked Examples
Input
Multiple abnormal vitals and labs in ICU patient
Result
APACHE II = 25 (moderate-high risk)
Extensive calculation
Common Mistakes to Avoid
- ✕Recalculating after initial admission (only first 24 hours counts)
- ✕Omitting any of the 12 components
Frequently Asked Questions
When is APACHE II useful?
Predicting ICU mortality, comparing patient cohorts, and understanding disease severity at admission.
What are limitations?
Requires many variables, doesn't predict individual outcomes well, and is computationally complex.
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