APACHE II (ICU mortality estimate)
APACHE II score (Knaus 1985): twelve acute-physiology variables plus age points and chronic-health points; total 0-71 with the mortality band.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Temperature
- 39 C
- Mean arterial pressure
- 60 mmHg
- Heart rate
- 120 bpm
- Respiratory rate
- 30 /min
- Oxygenation
- 65 mmHg
- Arterial pH
- 7.3
- Serum sodium
- 150 mmol/L
- Serum potassium
- 5.6 mmol/L
- Serum creatinine
- 2 mg/dL
- Hematocrit
- 48 %
The other 3 values
- WBC
- 18 x10^3/uL
- Glasgow Coma Scale
- 13
- Age
- 60 years
Result: APACHE II 23 (20-24: about 40% approximate hospital mortality).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- 0-4
- About 4% approximate hospital mortality.
- 5-9
- About 8%.
- 10-14
- About 15%.
- 15-19
- About 25%.
- 20-24
- About 40%.
- 25-29
- About 55%.
- 30-34
- About 75%.
- >=35
- About 85%.
What you enter
- Temperature
- Mean arterial pressure
- Heart rate
- Respiratory rate
- Oxygenation: PaO2
- Arterial pH
- Serum sodium
- Serum potassium
- Serum creatinine
- Hematocrit
The other 5 fields
- WBC
- Glasgow Coma Scale (3-15)
- Age
- Severe chronic-organ insufficiency / immunocompromise
- Nonoperative or emergency postoperative admission
How this is calculated
Citation
Knaus WA, et al. Crit Care Med. 1985;13(10):818-829 (APACHE II). Twelve acute-physiology variables + age + chronic-health points; total 0-71. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.