SOFA is used to define sepsis (an acute increase of 2 or more points due to infection) and to monitor ICU patients day by day. Rising scores in the first 48 hours predict higher mortality.
How to use the SOFA Score Calculator
- PaO₂/FiO₂ ratio
- On respiratory support (ventilation or CPAP)
- Platelets
- Bilirubin
- Cardiovascular
- Glasgow Coma Scale
- Creatinine
- Urine output (0 if unknown)
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter the worst values in the last 24 hours.
Inputs explained
| Field | What to enter |
|---|---|
| PaO₂/FiO₂ ratio | In mmHg |
| On respiratory support (ventilation or CPAP) | Choose one: No, Yes |
| Platelets | In ×10³/µL |
| Bilirubin | Units: mg/dL, µmol/L |
| Cardiovascular | Choose one: MAP ≥ 70 mmHg, MAP < 70 mmHg, Dopamine ≤ 5 or any dobutamine, Dopamine > 5, or epinephrine/norepinephrine ≤ 0.1 µg/kg/min … |
| Glasgow Coma Scale | A number |
| Creatinine | Units: mg/dL, µmol/L |
| Urine output (0 if unknown) | In mL/day |
Example values
How the main result changes when PaO₂/FiO₂ ratio changes and everything else stays at the example values above:
| PaO₂/FiO₂ ratio (mmHg) | SOFA score (/ 24) |
|---|---|
| 140 | 3 |
| 210 | 3 |
| 280 | 3 |
| 350 | 2 |
| 420 | 1 |
| 560 | 1 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Respiration (PaO₂/FiO₂): ≥ 400 0, < 400 1, < 300 2, < 200 with support 3, < 100 with support 4
Platelets (×10³/µL): ≥ 150 0, < 150 1, < 100 2, < 50 3, < 20 4
Bilirubin (mg/dL): < 1.2 0, 1.2–1.9 1, 2–5.9 2, 6–11.9 3, ≥ 12 4
Cardiovascular: MAP ≥ 70 0, < 70 1, then by vasopressor dose 2–4
GCS: 15 0, 13–14 1, 10–12 2, 6–9 3, < 6 4
Renal: creatinine (mg/dL) < 1.2 0, 1.2–1.9 1, 2–3.4 2, 3.5–4.9 or urine < 500 mL/d 3, ≥ 5 or urine < 200 mL/d 4
Worked example
Inputs — PaO₂/FiO₂ ratio: 280 mmHg; On respiratory support (ventilation or CPAP): No; Platelets: 120 ×10³/µL; Bilirubin: 1 mg/dL; Cardiovascular: MAP ≥ 70 mmHg; Glasgow Coma Scale: 15; Creatinine: 1 mg/dL; Urine output (0 if unknown): 0 mL/day.
Results — Respiration = 2 points; Coagulation = 1 points; Liver = 0 points; Cardiovascular = 0 points; Central nervous system = 0 points; Renal = 0 points; SOFA score = 3 / 24; Approximate ICU mortality = Under 10%.
Key terms
- SOFA
- Sequential Organ Failure Assessment.
Frequently asked questions
What SOFA score defines sepsis?
An acute increase of 2 or more points from baseline, due to infection.
What is a high SOFA score?
Above 11 is associated with high mortality.
Why use the worst value?
SOFA is scored daily with the worst value of each parameter in 24 hours.