How this calculator works
Each of the six organ systems contributes 0 to 4 points, so the total runs from 0 to 24. Score the worst value recorded during the stated 24-hour window. The respiratory points for 3 and 4 require respiratory support; the cardiovascular row uses the highest vasopressor dose given for at least one hour. A higher total or a rising total describes more organ dysfunction. The score is not a diagnosis, a treatment threshold or a substitute for clinical assessment, and it cannot be converted back into the original measurements. The result is an estimate for information only and is not medical advice.
Formula
SOFA = respiratory points + coagulation points + liver points + cardiovascular points + central nervous system points + renal points. Each component is read from its published band, and the sum is 0 to 24.
Worked example
A patient with PaO2/FiO2 at least 400 (0), platelets 120 (1), bilirubin 1.0 mg/dL (0), mean arterial pressure 75 mmHg (0), Glasgow Coma Scale 13 to 14 (1) and creatinine 1.5 mg/dL (1) totals 3. Changing only the Glasgow Coma Scale to 10 to 12 raises the total to 4.
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Frequently asked questions
Which value should I enter when several were recorded?
Use the worst value in the 24-hour scoring window for each organ system, as the original score specifies.
Do points 3 and 4 for respiration need ventilatory support?
Yes. PaO2/FiO2 below 200 earns 3 only with respiratory support, and below 100 earns 4 only with respiratory support.
Does a total of zero exclude organ dysfunction?
No. It records the selected bands at that moment. Values outside the bands, and changes over time, still need clinical review.
Can I recover the measurements from the total?
No. Many combinations produce the same total, so the breakdown table is the only record of which components scored.