SOFA Score Calculator

The original Sequential Organ Failure Assessment (SOFA) score assigns 0 to 4 points across six organ systems: respiratory, coagulation, liver, cardiovascular, central nervous system, and kidney. The total ranges from 0 to 24 and describes the extent of organ dysfunction in critically ill adults.

This is an intensive-care scoring aid, not a self-assessment, diagnosis, or universal mortality calculator. Component definitions depend on laboratory units, organ support, medicine doses, Glasgow Coma Scale assessment, and timing. Critical-care clinicians must select and interpret every item.

1. Select the respiratory category using PaO₂/FiO₂ and respiratory-support status.
2. Select platelet count, bilirubin, and cardiovascular support categories in the displayed units.
3. Select the Glasgow Coma Scale band and kidney category from creatinine or urine output.
4. Select Calculate to add six values, each from 0 to 4.
5. Document the time point and raw measurements; repeated scores require consistent definitions.

If alternative criteria within a component differ, clinical scoring rules determine the applicable severity. Sedation and missing values need expert handling.

Higher totals represent greater dysfunction across the scored systems. Admission, daily, maximum, and change scores answer different questions; record which was used. Trends may add information, but treatment should target the patient’s condition rather than a number alone.

Studies have found association with outcomes, yet calibration and discrimination differ between cohorts. The original score dates from 1996, and a SOFA-2 consensus update reflects changes in critical care. This page remains an original-category calculator. It must not delay sepsis recognition, resuscitation, consultation, or escalation. Acute deterioration requires immediate clinical response.

Component scoring is ordinal: a change from 0 to 1 is not guaranteed to represent the same physiologic change as 3 to 4, and totals with the same value can come from very different organ patterns. Always retain the six components rather than reporting only the sum.

Timing is central to sequential assessment. A score at admission, the worst value in 24 hours, and a value after treatment are not interchangeable. Clinical studies specify windows and missing-data rules; bedside teams use locally approved conventions. The calculator cannot infer either from selected numbers.

PaO₂/FiO₂ depends on a reliable arterial oxygen value and inspired oxygen fraction. Vasoactive medicine doses require correct weight and units. Bilirubin, creatinine, and platelet thresholds use particular laboratory units. Urine output spans a time interval. These details can shift a component by several points.

Glasgow Coma Scale assessment may be obscured by sedation, intubation, paralysis, or pre-existing neurologic disease. A trained clinician must decide how to document those circumstances. A numerically correct sum cannot repair incorrectly chosen categories.

A total of zero means all six selected categories received zero points at that time; it does not certify that the patient is healthy or free of critical illness. Conditions outside the six systems and early disease may still demand urgent care.