SOFA Score Calculator | Sequential Organ Failure Assessment

Q: What is the difference between SOFA and qSOFA?

qSOFA is a simplified bedside screening tool using only 3 criteria to identify patients at risk for sepsis outside the ICU. The full SOFA score requires laboratory data and is used for definitive assessment and monitoring in the ICU.

Q: What constitutes a baseline SOFA score?

For patients with pre-existing organ dysfunction, their baseline SOFA score may be non-zero. Sepsis is defined as an acute increase of 2 or more points above this baseline. If the baseline is unknown, it is assumed to be 0.

1. Respiration PaO₂/FiO₂ ratio (mmHg)

2. Coagulation Platelets (×10³/µL)

3. Liver Bilirubin (mg/dL)

4. Cardiovascular Hypotension or Vasopressors *Vasopressor doses in mcg/kg/min

5. CNS Glasgow Coma Scale (GCS)

6. Renal Creatinine (mg/dL) or Urine Output

Total SOFA Score

Mortality Risk < 10%

Initial score suggests lower severity.

Show score breakdown

Recent Updates

SOFA remains the standard organ-dysfunction score in Sepsis-3: in a patient with infection, an acute rise in total SOFA of ≥2 points defines sepsis.
Serial (trend) SOFA measurements are more useful for prognosis than a single value.
The original cardiovascular scoring is dopamine-centric and predates current practice, where norepinephrine is first-line and vasopressin is often added; interpret that row with this in mind.

Source: Singer M, et al. Sepsis-3 Consensus Definitions, 2016. JAMA 2016;315(8):801-810. doi:10.1001/jama.2016.0287 · Vincent JL, et al. Intensive Care Med 1996;22(7):707-710.

Key Knowledge Points

The SOFA Score (Sequential Organ Failure Assessment) is the standard for tracking organ dysfunction in ICU patients.
Sepsis-3 Definition: An acute change in total SOFA score of ≥ 2 points consequent to infection defines sepsis.
The score evaluates 6 organ systems: Respiratory, Coagulation, Hepatic, Cardiovascular, Neurologic, and Renal.
Scores range from 0 to 24. Higher scores correlate strongly with increased mortality; serial trends are more informative than a single value.

About This SOFA Score Calculator

This SOFA Score Calculator is designed for healthcare professionals to assess the severity of organ dysfunction in critically ill patients. Originally developed to describe the sequence of complications in ICU patients, it has become the primary clinical tool for operationalizing the definition of sepsis (replacing SIRS in Sepsis-3). By evaluating function across six key organ systems, the SOFA score provides a dynamic “snapshot” of a patient’s physiological status, helping to predict mortality and monitor response to therapeutic interventions.

How to Use This Calculator

Select the worst value measured during the preceding 24-hour period for each of the six categories. If a physiological parameter was not measured, it is generally assumed to be normal (score 0), unless clinical evidence suggests otherwise.

Scoring System Explained

The score assigns 0 to 4 points for each of the following systems:

Respiration: Based on the PaO₂/FiO₂ ratio. Scores of 3 and 4 indicate severe failure requiring mechanical ventilation.
Coagulation: Based on platelet count decline.
Liver: Based on serum bilirubin elevation.
Cardiovascular: Based on the degree of hypotension and the amount of vasoactive support required. The original criteria are dopamine-centric and predate current practice, where norepinephrine is first-line and vasopressin is often added.
Central Nervous System: Based on the Glasgow Coma Scale (GCS).
Renal: Based on serum creatinine elevation or oliguria.

Clinical Interpretation

The SOFA score is predominantly used to predict mortality. Serial evaluation (e.g., every 24 hours) is more valuable than a single score. The mortality figures below are approximate and vary by cohort and case-mix:

Score 0-6: Mortality risk approximately < 10%.
Score 7-9: Mortality risk approximately 15-20%.
Score 10-12: Mortality risk approximately 40-50%.
Score ≥ 15: Mortality risk approximately > 80%.
Score 24: Predicted mortality > 95%.

Frequently Asked Questions (FAQ)

1. What is the difference between SOFA and qSOFA?

qSOFA (quick SOFA) is a simplified bedside screening tool using only 3 criteria (altered mental status, respiratory rate ≥22, systolic BP ≤100) to flag at-risk patients outside the ICU. The full SOFA score requires laboratory data and is used for definitive assessment and monitoring in the ICU.

2. Why does the cardiovascular score prioritize vasopressors?

In the SOFA model, the requirement for vasopressor support indicates a more severe cardiovascular failure than hypotension alone. Higher doses result in higher scores (3 or 4) regardless of the Mean Arterial Pressure (MAP). Note that the original scoring is dopamine-centric and predates current practice, in which norepinephrine is first-line and vasopressin is often added; the cutoffs are retained as originally validated.

3. Can I use this for non-ICU patients?

While primarily validated for ICU patients, the SOFA score can be applied in other settings if the necessary laboratory values (ABG, bilirubin, creatinine, platelets) are available. However, qSOFA or NEWS2 might be more practical for initial ward screening.

4. What constitutes a “baseline” SOFA score?

For patients with pre-existing organ dysfunction (e.g., chronic kidney disease), their baseline SOFA score may be non-zero. Sepsis is defined as an acute increase of ≥2 points above this baseline. If the baseline is unknown, it is assumed to be 0.

5. Does the renal score account for dialysis?

The original SOFA validation used creatinine and urine output. However, in clinical practice, a patient requiring new-onset renal replacement therapy (dialysis) for acute kidney injury is typically assigned a renal score of 4, reflecting severe organ failure.

Related Calculators

📖 Sources:

⚠️ Disclaimer:

This tool is for informational and educational purposes only and is not a substitute for professional clinical judgment. All treatment decisions must be made by a qualified healthcare professional considering the individual patient’s full clinical context.