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APACHE II (Acute Physiology And Chronic Health Evaluation) is a method commonly used in medicine and critical care for predicting the severity of illness. It was first developed in 1985[1] and is available online.[2] A score from 0 to 71 is computed based on several different parameters and the higher the score the more severe the disease and associated risk of death.


  1. Knaus WA, Draper EA, Wagner DP, Zimmerman JE (October 1985). "APACHE II: a severity of disease classification system". Crit. Care Med. 13 (10): 818–29. PMID 3928249. [e]
  2. It is available online at http://www.sfar.org/scores2/apache22.html