How do I calculate the Sequential Organ Failure Assessment (SOFA) score?

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Last updated: October 19, 2026 • View editorial policy

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How to Calculate the SOFA Score

The SOFA (Sequential Organ Failure Assessment) score is calculated by assessing six organ systems—respiratory, cardiovascular, hepatic, coagulation, renal, and neurological—with each system scored from 0 (normal) to 4 (most abnormal), for a total possible score of 0-24 points. 1

The Six Organ Systems and Their Scoring

1. Respiratory System (PaO2/FiO2 ratio)

  • 0 points: PaO2/FiO2 >400
  • 1 point: PaO2/FiO2 >300–≤400
  • 2 points: PaO2/FiO2 >200–≤300
  • 3 points: PaO2/FiO2 >100–≤200
  • 4 points: PaO2/FiO2 ≤100

2. Cardiovascular System (Mean Arterial Pressure and Vasopressors)

  • 0 points: MAP ≥70 mmHg
  • 1 point: MAP <70 mmHg
  • 2 points: Dopamine ≤5 μg/kg/min OR dobutamine (any dose) OR epinephrine ≤0.1 μg/kg/min OR norepinephrine (any dose)
  • 3 points: Dopamine >5 μg/kg/min OR epinephrine >0.1 μg/kg/min OR norepinephrine ≤0.1 μg/kg/min
  • 4 points: Dopamine >15 μg/kg/min OR epinephrine >0.1 μg/kg/min OR norepinephrine >0.1 μg/kg/min

3. Hepatic System (Bilirubin)

  • 0 points: Bilirubin <1.2 mg/dL
  • 1 point: Bilirubin ≥1.2–<2.0 mg/dL
  • 2 points: Bilirubin ≥2.0–<6.0 mg/dL
  • 3 points: Bilirubin ≥6.0–<12.0 mg/dL
  • 4 points: Bilirubin ≥12.0 mg/dL

4. Coagulation System (INR and Platelet Count)

  • 0 points: INR <1.1
  • 1 point: INR ≥1.1–<1.25
  • 2 points: INR ≥1.25–<1.5
  • 3 points: INR ≥1.5–<2.5
  • 4 points: INR ≥2.5 OR platelets ≤20,000/mm³

5. Renal System (Creatinine)

  • 0 points: Creatinine <1.2 mg/dL
  • 1 point: Creatinine ≥1.2–<2.0 mg/dL
  • 2 points: Creatinine ≥2.0–<3.5 mg/dL
  • 3 points: Creatinine ≥3.5–<5.0 mg/dL
  • 4 points: Creatinine ≥5.0 mg/dL

6. Neurological System (Glasgow Coma Scale)

  • 0 points: GCS 15 (no hepatic encephalopathy)
  • 1 point: GCS 13-14 (HE Grade I)
  • 2 points: GCS 10-12 (HE Grade II)
  • 3 points: GCS 6-9 (HE Grade III)
  • 4 points: GCS <6 (HE Grade IV)

1

Practical Application

Calculate the score by obtaining the worst value for each organ system within a 24-hour period, then sum all six components. The SOFA score was originally designed for sequential assessment in critically ill patients with sepsis, allowing tracking of organ dysfunction over time 2.

Key Clinical Context

The SOFA score performs well for mortality prediction with a pooled area under the ROC curve of 0.75 in complicated intra-abdominal infections 2. However, SOFA has important limitations: it was developed specifically for ICU patients with sepsis and organ failure, not for categorizing patients with low-moderate severity or those without organ failure within 24 hours of admission 2. Additionally, SOFA does not incorporate age or chronic comorbidities, which are important mortality predictors 2.

Common Pitfalls to Avoid

  • Don't use SOFA as the sole decision-making tool for individual patients—it was designed for sequential assessment and research, not to guide specific interventions 2
  • Ensure you're using the worst values within the 24-hour period, not random spot checks
  • In cirrhosis patients, use the CLIF-SOFA modification which has been specifically adapted for this population 1
  • Remember that automated SOFA calculations from electronic health records show high agreement with manual scoring (ICC 0.99), making electronic calculation reliable when available 3

The total SOFA score ranges from 0-24, with higher scores indicating more severe organ dysfunction and higher mortality risk 4.

References

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.