SAPS II is a severity of disease classification system. Its name stands for 'Simplified Acute Physiology Score', and is one of several ICU scoring systems. SAPS II is a severity of disease classification system. Its name stands for 'Simplified Acute Physiology Score', and is one of several ICU scoring systems. SAPS II was designed to measure the severity of disease for patients admitted to Intensive care units aged 15 or more. 24 hours after admission to the ICU, the measurement has been completed and resulted in an integer point score between 0 and 163 and a predicted mortality between 0% and 100%. No new score can be calculated during the stay. If a patient is discharged from the ICU and readmitted, a new SAPS II score can be calculated.