Sequential Organ Failure Assessment Score
Sequential Organ Failure Assessment (SOFA) Score · Also known as: SOFA, Sepsis-related Organ Failure Assessment
The Sequential Organ Failure Assessment (SOFA) score, introduced by Vincent and Moreno in 1996, is a 24-point daily assessment tool that quantifies organ dysfunction across six physiological systems in critically ill patients. It was adopted into the 2016 Sepsis-3 definitions and is now the international standard for identifying and grading sepsis-related organ failure.
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When to use it
SOFA is essential in ICU settings for daily assessment of organ dysfunction, sepsis diagnosis, and prognostic stratification. It is superior to APACHE II for detecting change because it can be recalculated daily and is not weighted toward initial presentation. SOFA is preferred in sepsis research and sepsis quality initiatives. Its simplicity makes it feasible for routine use.
Strengths & limitations
- Dynamic assessment: recalculated daily to capture clinical trajectory and response to interventions
- Simple, objective variables (no complex weighting) enabling rapid calculation at the bedside
- Strong association with mortality; each additional point predicts substantially worse outcome
- Adopted into international sepsis definitions (Sepsis-3), promoting standardization and communication
- Performs well across diverse ICU populations and is easy to train clinicians to use
- Requires daily collection of parameters; missing data or delayed sampling can bias scores
- Does not account for pre-existing organ dysfunction (e.g., chronic renal disease); SOFA assumes normal baseline
- Organ-specific thresholds were derived from sepsis populations; may not apply equally to non-sepsis critical illness
- Does not include age or comorbidity weighting, potentially underestimating risk in frail elderly patients
- PaO₂/FiO₂ ratio is not always readily available; requires simultaneous arterial blood gas and FiO₂ documentation
Frequently asked
What is the difference between SOFA and qSOFA?
SOFA is a comprehensive 6-organ score calculated daily in hospitalized patients. qSOFA (quick SOFA) is a 3-variable bedside screening tool (altered mentation, systolic BP < 100, respiratory rate ≥ 22) designed for rapid sepsis identification in non-ICU settings. qSOFA is faster but less sensitive; SOFA is more detailed and better for risk stratification.
How do I score SOFA if the patient is sedated?
Document the Glasgow Coma Scale as written (sedated patients typically score lower because they are intentionally sedated). Use other SOFA components normally. Some experts note that sedation artificially lowers the neurological score; consider whether sedation itself is driving the high SOFA or whether there is true organ dysfunction.
Can SOFA predict which sepsis patients will survive?
SOFA predicts population mortality risk: higher SOFA = worse prognosis. However, individual trajectories vary widely. A low SOFA at 24 hours despite initial sepsis suggests good response and favorable prognosis. Conversely, rising SOFA indicates deterioration. Serial SOFA change is more predictive than absolute value.
Should I calculate SOFA on ICU day 1 or at ICU admission?
SOFA is typically calculated using the worst values within each 24-hour period. In practice, ICU day 1 SOFA is calculated from the first 24 hours after ICU admission. Thereafter, daily SOFA is recalculated each morning using overnight values. Consistency in timing supports valid trend comparison.
Sources
- Vincent, J. L., Moreno, R., Takala, J., et al. (1996). The SOFA (Sepsis-related Organ Failure Assessment) score to describe organ dysfuncti on/failure. Intensive Care Medicine, 22(7), 707-710. DOI: 10.1007/BF01709751 ↗
- Singer, M., Deutschman, C. S., Seymour, C. W., et al. (2016). The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA, 315(8), 801-810. DOI: 10.1001/jama.2016.0287 ↗
How to cite this page
ScholarGate. (2026, June 3). Sequential Organ Failure Assessment (SOFA) Score. ScholarGate. https://scholargate.app/en/clinical-assessment/sofa-score
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
- APACHE II ScoreClinical Assessment↔ compare
- Modified Early Warning ScoreClinical Assessment↔ compare
- qSOFA ScoreClinical Assessment↔ compare