SAPS II ICU Severity Score Calculator

Age in years

Type of admission

Heart rate beats per minute

Systolic blood pressure mmHg

Body temperature Celsius

Glasgow coma score

Mechanical ventilation or CPAP in first 24 hours

PaO2 mmHg

FiO2 percent

Urine output in liters per 24 hours

BUN mg per dL

Sodium mEq per L

Potassium mEq per L

Bicarbonate mEq per L

Total bilirubin mg per dL

White blood cells per mm3

Chronic disease

Simplified Acute Physiology Score II SAPS II Explanation and Clinical Context
The SAPS II score is a validated severity of illness classification intended to estimate risk of hospital death for adult patients admitted to intensive care units using the worst values collected in the first 24 hours after admission. The score aggregates points from 15 items including age type of admission heart rate systolic blood pressure body temperature Glasgow coma score mechanical ventilation PaO2 and FiO2 urine output blood urea nitrogen serum sodium serum potassium serum bicarbonate total bilirubin white blood cell count and specified chronic diseases. The integer sum ranges from 0 to 163 and is converted to an estimated probability of hospital death using a logistic formula derived from the original study. Use the worst physiologic value in the first 24 hours for each variable and apply the mapped points for each category when calculating the score. The tool is intended to support benchmarking and risk description and not to replace clinical judgment when making individual patient decisions.

Reference
Le Gall J R Lemeshow S Saulnier F A new Simplified Acute Physiology Score SAPS II based on a European North American multicenter study JAMA 1993 270 2957 2963. For practical tables and implementation guidance see ClinCalc SAPS II calculator and MDApp SAPS II description and point table.

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