What are the 17 variables in SAPS II?

SAPS II uses: age, HR, SBP, temperature, GCS, mechanical ventilation, PaO2/FiO2 ratio, urine output, BUN, sodium, potassium, bicarbonate, bilirubin, WBC, chronic diseases (AIDS, metastatic cancer, hematologic malignancy), and admission type (elective/non-elective surgery/medical). Scores range 0 to 163; mortality from logistic equation using score.

How is SAPS II mortality probability calculated?

Logit = -7.7631 + 0.0737 x SAPS II score + 0.9971 x ln(SAPS II+1). Mortality probability = e^logit / (1+e^logit). Score 29 to 40 corresponds to approximately 25% mortality; score 64 to 77 approximately 75% mortality. Calibration is better for European ICU populations where the score was derived.

SAPS II Simplified Acute Physiology Score

Calculate the Simplified Acute Physiology Score II using 17 variables (worst in 24h) to estimate in-hospital mortality probability in ICU patients without surgery-specific or diagnosis-specific adjustments.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How to Use

Enter the values for the scenario you are assessing. Calculate the Simplified Acute Physiology Score II using 17 variables (worst in 24h) to estimate in-hospital mortality probability in ICU patients without surgery-specific or diagnosis-specific adjustments. Use the saps ii score result to inform your calculation.

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