Sofa Score Calculator
Calculate Sequential Organ Failure Assessment score for sepsis and organ dysfunction. Enter values for instant results with step-by-step formulas.
Formula
SOFA = Respiration(0-4) + Coagulation(0-4) + Liver(0-4) + Cardiovascular(0-4) + CNS(0-4) + Renal(0-4)
Six organ systems are each scored 0-4 based on degree of dysfunction. Total score ranges from 0 to 24. Higher scores indicate greater organ dysfunction and higher ICU mortality. SOFA ≥2 with suspected infection meets the Sepsis-3 definition of sepsis.
Worked Examples
Example 1: Mild Organ Dysfunction
Problem: ICU patient with mild hypoxia (PaO2/FiO2 350), slightly low platelets (130k), alert, normal BP, normal renal function.
Solution: Respiration: 1 (PaO2/FiO2 301-400)\nCoagulation: 1 (Platelets 100-149)\nLiver: 0\nCardiovascular: 0\nCNS: 0\nRenal: 0\nTotal SOFA = 2\nMortality: ~3-5%
Result: SOFA 2 — Low-Moderate severity, meets Sepsis-3 threshold if infection present
Example 2: Severe Multi-Organ Failure
Problem: Septic shock patient: PaO2/FiO2 80 on ventilator, platelets 18k, bilirubin 8.5, on norepinephrine 0.3, GCS 7, creatinine 4.2.
Solution: Respiration: 4\nCoagulation: 4\nLiver: 3\nCardiovascular: 4\nCNS: 3\nRenal: 3\nTotal SOFA = 21\nMortality: >80%
Result: SOFA 21 — Critical, multi-organ failure with very high mortality
Frequently Asked Questions
What is the SOFA score?
The Sequential Organ Failure Assessment (SOFA) score is used to track a patient's status in the ICU by assessing the extent of organ dysfunction across six organ systems: respiratory, coagulation, liver, cardiovascular, central nervous system, and renal. Each system is scored 0-4, giving a total range of 0-24. Higher scores indicate greater organ dysfunction and higher mortality risk. It is also a key component of the Sepsis-3 definition.
How does SOFA relate to sepsis diagnosis?
Under the Sepsis-3 definition (2016), sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection. Organ dysfunction is identified as an acute change in total SOFA score ≥2 points consequent to the infection. A SOFA score ≥2 in the setting of suspected infection has a mortality of approximately 10% or greater.
What is the qSOFA score?
The quick SOFA (qSOFA) is a bedside screening tool using three criteria: altered mental status (GCS <15), systolic BP ≤100 mmHg, and respiratory rate ≥22. Two or more qSOFA points should prompt further assessment for organ dysfunction (full SOFA score), increased monitoring, and consideration of infection. qSOFA is not a diagnostic tool but a screening prompt.
How often should SOFA be calculated?
SOFA should be calculated at ICU admission and then every 24-48 hours to track organ dysfunction trends. The change in SOFA (delta-SOFA) over time is more predictive of outcome than a single measurement. An increasing SOFA score suggests worsening organ dysfunction and carries a worse prognosis, while a decreasing score suggests recovery.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
What formula does Sofa Score Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.