APACHE II
ICU severity of illness from twelve physiological variables, age and chronic health.
When to use it. Describing severity of illness in an ICU cohort, and comparing case-mix between units or trials.
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Limits of this score. Built for populations, not for individuals — it must never drive a treatment decision for one patient. It uses the WORST value in the first 24 hours of ICU admission, so it cannot be scored on arrival. The mortality figures below come from 1985 cohorts and substantially overstate risk against modern intensive care.
Sources
- Knaus WA, et al. APACHE II: a severity of disease classification system. Crit Care Med. 1985.
Where this is written from. This site is written from Indian clinical practice. Drug availability and brand names, vaccination schedules, national health programmes and some reference cut-offs differ between countries — a schedule or a threshold that is standard here may not be standard where you are. If you are reading outside India, check anything on this page against your own country’s guidance before you act on it.
Educational use only — not medical advice. Never a substitute for clinical judgement.