APACHE II Scoring System

Temperature (Degrees C)
Mean Arterial Pressure (mmHg)
Heart Rate
Respiratory Rate
A-aPO2(FiO2>50%) or PaO2(FiO2<50%)
Arterial pH or HCO3
Serum Na+ (mEq/L)
Serum K+ (mEq/L)
Serum Creatinine (ARF means Acute Renal Failure)
WBC Count(10^3/#gl)
Glasgow Coma Score
Enter Glasgow score and computer subtracts from 15 for point value
Age (years)
Chronic Health Problems: 1) Cirrhosis of the liver confirmed by biopsy 2) New York Heart Association Class IV 3) Severe COPD -- Hypercapnia, home O2 use, or pulmonary hypertension 4) On regular dialysis or 5) Immunocompromised
None (0 points)
Non-Surgical (5 points)
Emergent operation (5 points)
Elective operation (2 points)
Result: Total Criteria Point Count:

Apache II Score / Approximate Mortality Interpretation

  • For the APACHE II score to be correct, a value must be selected for every variable.
  • The numbers in the parentheses represent the point value assigned to each clinical parameter above. The Apache Score is the sum of these points.
  • Chronic Dx includes biopsy proven cirrhosis and documented portal hypertension; past upper GI bleeding attributed to portal hypertension; prior hepatic failure; prior hepatic encephalopathy; NYHA class IV; chronic restrictive, obstructive, or vascular lung disease resulting in severe exercise restriction; documented hypoxemia or hypercapnia; secondary polycythemia; severe pulmonary hypertension (>40 mmHg); ventilator dependence; chronic hemodialysis.
  • Chronic Dx also includes immunosuppression from chemotherapy, radiation therapy, long-term or recent high-dose steroids, immunodeficiency (eg, leukemia, lymphoma, AIDS).
  1. Knaus WA, et al. APACHE II: a severity of disease classification system. Crit Care Med. 1985 Oct;13(10):818-29.
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