liminfoSOFA Score Calculator
Free web tool: SOFA Score Calculator
SOFA Score
0/24
Severity
Low
Est. ICU Mortality
<1%
Respiration
0
Coagulation
0
Liver
0
Cardiovascular
0
CNS
0
Renal
0
SOFA Score. For clinical reference only.
About SOFA Score Calculator
The SOFA Score Calculator implements the Sequential Organ Failure Assessment (SOFA) score, a validated clinical scoring system used in intensive care units (ICUs) to quantify the degree of organ dysfunction and predict ICU mortality. The tool evaluates six organ systems — respiration (PaO2/FiO2 ratio), coagulation (platelet count), liver function (bilirubin), cardiovascular (mean arterial pressure and vasopressor requirements), central nervous system (Glasgow Coma Scale), and renal function (serum creatinine and urine output) — each scored from 0 to 4, for a maximum total of 24 points.
Each organ system component uses clinically established cutoff values: respiratory score uses the PaO2/FiO2 ratio with ventilator status, coagulation uses platelet counts in thousands per µL, liver uses bilirubin in mg/dL, cardiovascular uses MAP threshold and dopamine/epinephrine/dobutamine dose tiers, CNS uses the standard 15-point Glasgow Coma Scale, and renal uses creatinine in mg/dL with urine output thresholds of <500 mL/day and <200 mL/day. The total score maps directly to published ICU mortality probability tables, from under 1% at scores 0–1 to over 95% at scores 23–24.
The calculator is intended for clinical reference and education only. It does not constitute medical advice and should always be used alongside clinical judgment and direct patient assessment. All processing is client-side; no patient data is transmitted or stored. Healthcare professionals can use this tool bedside on any device without login requirements.
Key Features
- Scores all 6 SOFA organ systems: respiration, coagulation, liver, cardiovascular, CNS, renal
- Each component scored 0–4 using clinically validated thresholds
- Total score out of 24 with real-time update on every dropdown change
- ICU mortality estimate mapped to published SOFA score probability tables
- Severity classification: Low (0–6), Moderate (7–12), High (13–18), Very High (19–24)
- Per-organ score breakdown grid for quick clinical review
- Color-coded severity indicator — green through red based on total score
- 100% client-side — no patient data leaves the browser
Frequently Asked Questions
What is the SOFA score?
SOFA (Sequential Organ Failure Assessment) is a scoring system published in 1994 to describe organ dysfunction in critically ill patients. It evaluates six organ systems — respiratory, coagulation, hepatic, cardiovascular, neurological, and renal — each on a 0–4 scale. The total score (0–24) correlates with ICU mortality risk and is widely used for prognosis and tracking patient deterioration or improvement over time.
How is the respiratory SOFA score determined?
The respiratory component uses the PaO2/FiO2 (P/F) ratio: score 0 for P/F ≥ 400, score 1 for 300–399, score 2 for 200–299, score 3 for 100–199 with mechanical ventilation, and score 4 for <100 with ventilation. Lower P/F ratios indicate worse gas exchange and more severe respiratory failure.
What vasopressor doses are used for the cardiovascular SOFA score?
Cardiovascular scoring uses mean arterial pressure (MAP) and vasopressor doses in µg/kg/min: score 0 for MAP ≥ 70 mmHg without vasopressors, score 1 for MAP < 70, score 2 for dopamine ≤ 5 or any dobutamine, score 3 for dopamine > 5 or epinephrine ≤ 0.1, and score 4 for dopamine > 15 or epinephrine > 0.1.
What is the difference between SOFA and qSOFA?
SOFA is the full 6-organ-system assessment requiring laboratory values. qSOFA (quick SOFA) is a simplified 3-criteria bedside screen: altered mental status (GCS < 15), respiratory rate ≥ 22/min, and systolic BP ≤ 100 mmHg. qSOFA is used outside the ICU to rapidly identify sepsis risk. SOFA is used inside the ICU for detailed organ failure quantification and mortality prediction.
How accurate is the SOFA score for mortality prediction?
The SOFA score has been validated in multiple large ICU studies. In the original Vincent et al. (1996) cohort, scores above 11 correlated with >90% ICU mortality. However, mortality rates vary by institution, patient population, era of care, and treatment advances. The mortality estimates shown are approximate population averages from published literature and should be interpreted as probabilistic guidance, not individual predictions.
Can the SOFA score be used to diagnose sepsis?
The Sepsis-3 definitions (2016) use an acute increase in SOFA score ≥ 2 points as the clinical criterion for organ dysfunction in sepsis. A patient with suspected infection and SOFA increase ≥ 2 meets the sepsis definition. Septic shock is defined as vasopressor requirement to maintain MAP ≥ 65 and lactate > 2 mmol/L despite adequate resuscitation.
How often should SOFA be recalculated in the ICU?
SOFA is typically calculated on ICU admission and then every 24–48 hours. Serial SOFA scores are more prognostically valuable than single measurements: a rising score indicates organ dysfunction is progressing; a falling score suggests improving organ function. Some protocols calculate SOFA daily for the duration of ICU stay.
Is this calculator validated for clinical use?
This tool faithfully implements the published SOFA scoring criteria for educational and clinical reference purposes. It is not a certified medical device and should not replace clinical judgment or validated clinical decision support systems integrated into an electronic health record. Always verify scores against the original SOFA literature and apply clinical expertise when managing individual patients.