Calculator Inputs
Example Data Table
| Scenario | Key Inputs | Subscores | Total |
|---|---|---|---|
| Example A | PaFi 280, Plt 120, Bili 2.6, MAP 68, GCS 13, Cr 1.9 | Resp 2, Coag 1, Liver 2, CV 1, CNS 1, Renal 1 | 8 |
| Example B | PaFi 90 + support, Plt 18, Bili 13.2, Norepi 0.15, GCS 6, Urine 180 | Resp 4, Coag 4, Liver 4, CV 4, CNS 3, Renal 4 | 23 |
Examples are illustrative for education and UI testing.
Formula Used
The total SOFA score is the sum of six 0–4 subscores:
- Respiration: PaO2/FiO2 ratio, with respiratory support affecting severe thresholds.
- Coagulation: platelet count cutoffs.
- Liver: bilirubin bands.
- Cardiovascular: MAP and vasopressor categories (highest applicable score wins).
- CNS: Glasgow Coma Scale ranges.
- Renal: creatinine levels and urine output (worst of the two).
How to Use This Calculator
- Enter the latest available labs and vitals.
- Indicate respiratory support and any vasoactive infusions.
- Click Calculate SOFA to see subscores and total.
- Review the chart to spot the strongest drivers.
- Export CSV for records, or PDF for a note attachment.
Why SOFA matters in critical care workflows
SOFA summarizes dysfunction across six organ domains using simple bedside measurements. Each domain contributes 0–4 points, producing a total from 0–24. In ICU practice, clinicians compare the current score with a prior baseline to detect deterioration. A score standardizes handoffs, enabling teams to communicate using one language.
Respiration domain data and practical entry tips
The respiration subscore uses the PaO2/FiO2 ratio. Typical cut points include ≥400 for 0 points, 300–399 for 1, 200–299 for 2, 100–199 for 3 with respiratory support, and <100 for 4 with support. When FiO2 is documented as a percentage, convert it to a fraction before calculating the ratio (for example, 50% becomes 0.50).
Coagulation and liver: labs that shift quickly
Platelet and bilirubin values can change within hours during sepsis, bleeding, or cholestasis. Platelets ≥150 score 0, while <20 scores 4. Bilirubin below 1.2 mg/dL scores 0 and ≥12 mg/dL scores 4. Trending both labs alongside transfusion or biliary interventions helps explain sudden jumps in total score.
Cardiovascular scoring with vasopressor categories
The cardiovascular component reflects perfusion using MAP and vasoactive support. MAP under 70 mmHg yields 1 point when no pressor category applies. Dopamine and catecholamine thresholds commonly classify 2, 3, or 4 points, and the highest applicable category is used. Documenting exact doses is important because small titrations can move the score up or down.
Neurologic and renal domains: integrating two inputs
The CNS domain maps GCS to points: 15 is 0, 13–14 is 1, 10–12 is 2, 6–9 is 3, and below 6 is 4. The renal domain uses creatinine bands, but urine output can override it when oliguria is present. For example, urine below 500 mL/day indicates at least 3 points, and below 200 mL/day indicates 4.
Using totals, partial scores, and exports responsibly
This calculator supports complete and partial scoring when some data are missing. A partial total can still highlight which organ systems drive risk, but it should not be used as a standalone diagnostic tool. Use the bar chart to visualize subscores and the export options to share results in notes, audits, and quality improvement reviews.
FAQs
1) Can I calculate SOFA with missing labs?
Yes. The calculator returns a partial total and lists missing domains. Use partial results for documentation and trend awareness, and complete the score when data become available.
2) Does respiratory support always change the respiration score?
It mainly affects severe thresholds. Scores of 3 and 4 typically require respiratory support with low PaO2/FiO2 ratios. Enter support accurately to avoid over- or under-scoring.
3) Which cardiovascular value should I enter if multiple pressors run?
Enter all relevant doses. The calculator selects the highest applicable cardiovascular category from MAP, dobutamine use, dopamine, epinephrine, and norepinephrine thresholds.
4) Should I use creatinine or urine output for renal scoring?
Provide both when possible. The calculator takes the worse renal score between creatinine bands and urine output cutoffs, reflecting kidney dysfunction more conservatively.
5) How should I interpret the severity band shown here?
The band is a practical summary for quick review. It is not a prognosis or diagnosis. Always interpret results in context of the clinical scenario and local protocols.
6) What does the PDF export include?
The PDF contains entered inputs, each domain subscore, total SOFA, and the displayed band. Use it for attachments to notes, audits, or handoff packets.