APACHE II severity score
ICU severity of illness from the worst values in the first 24 hours.
Inputs
2 of 16years
°C
mmHg
bpm
/min
%
mmHg
Used when FiO₂ is 50% or more.
mmHg
mEq/L
mEq/L
Stable value
Acute kidney failure
%
× 10³/µL
points
Severe organ insufficiency or immunocompromise
Patient values are shared with every calculator.
When to use
- Within 24 hours of ICU admission, using the worst value of each variable.
Pearls and pitfalls
- Mortality estimates need the diagnostic category weight; the bands shown are approximate.
- Creatinine points double in acute kidney failure.
Why use
The most widely used ICU severity score in trials.
Acute physiology points (12 variables) + age points + chronic health points