Assess organ failure severity using the Sequential Organ Failure Assessment (SOFA) score. Evaluate 6 organ systems with mortality risk interpretation for critical care settings.
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Mortality Risk: <10% โ Good prognosis, continue routine monitoring.
๐ก Moderate Severity (SOFA 8)
A patient with sepsis in the ICU: PaOโ/FiOโ 250 (Score 2), platelets 80 (Score 2), bilirubin 2.5 (Score 2), dopamine 4 ยตg/kg/min (Score 2), GCS 13 (Score 1), creatinine 1.5 (Score 1).
Total SOFA Score:10
Mortality Risk: ~40% โ Requires close ICU monitoring and aggressive management.
๐ด High Severity (SOFA 17)
A patient with multi-organ failure in the ICU: PaOโ/FiOโ 80 + ventilated (Score 4), platelets 15 (Score 4), bilirubin 14 (Score 4), norepinephrine 0.3 ยตg/kg/min (Score 4), GCS 5 (Score 4), creatinine 5.5 (Score 4).
Total SOFA Score:24
Mortality Risk: >80% โ Critical condition requiring maximum life support measures.
SOFA Scoring Guidelines
The Sequential Organ Failure Assessment (SOFA) score assesses severity of organ dysfunction in critically ill patients. Each of 6 organ systems is scored from 0 (normal) to 4 (most severe), for a total ranging from 0 to 24.
SOFA Scoring Criteria
System
Score 0
Score 1
Score 2
Score 3
Score 4
Respiration PaOโ/FiOโ
โฅ 400
300โ399
200โ299
100โ199*
< 100*
Coagulation Platelets ร10ยณ/ยตL
โฅ 150
100โ149
50โ99
20โ49
< 20
Liver Bilirubin mg/dL
< 1.2
1.2โ1.9
2.0โ5.9
6.0โ11.9
โฅ 12.0
Cardiovascular BP / Vasopressors
MAP โฅ 70
MAP < 70
Dopa โค 5 or Dobut
Dopa > 5, Epi โค 0.1, or Norepi โค 0.1
Dopa > 15, Epi > 0.1, or Norepi > 0.1
Neurological GCS Score
15
13โ14
10โ12
6โ9
< 6
Renal Creatinine / UO
Cr < 1.2
Cr 1.2โ1.9
Cr 2.0โ3.4
Cr 3.5โ4.9 or UO < 500
Cr โฅ 5.0 or UO < 200
* Scores 3 and 4 for respiration require ventilatory support. Vasopressor doses in ยตg/kg/min.
The Sequential Organ Failure Assessment (SOFA) score is a widely used clinical tool in intensive care medicine to assess the severity of organ dysfunction in critically ill patients. Originally developed by the European Society of Intensive Care Medicine in 1994, the SOFA score evaluates six organ systems โ respiratory, coagulation, liver, cardiovascular, neurological, and renal โ each scored from 0 (normal function) to 4 (severe dysfunction). The total score ranges from 0 to 24, with higher scores indicating greater organ failure severity and increased mortality risk.
The SOFA score is particularly valuable in managing patients with sepsis, as it helps clinicians monitor the progression of organ dysfunction over time. Serial SOFA scoring (performed daily or as clinically indicated) allows for objective tracking of a patient's clinical trajectory โ an improving SOFA score suggests recovery, while worsening scores may prompt escalation of therapy. The score's prognostic value has been validated across diverse ICU populations worldwide.
Clinical Applications
The SOFA score serves multiple purposes in critical care. It is used as part of the Sepsis-3 definition (a change in SOFA score of โฅ2 points in the presence of infection indicates sepsis), to stratify patients by illness severity, to track response to treatment, and to provide prognostic information to patients and families. The score can be calculated on admission (baseline SOFA) or sequentially throughout the ICU stay, with higher or increasing scores associated with worse outcomes.
Why Track Organ Failure Severity?
Systematic assessment of organ failure severity in critically ill patients is essential for several reasons:
๐ฅ Early Detection
Serial SOFA scoring enables early identification of worsening organ dysfunction, allowing timely intervention before irreversible damage occurs.
๐ Treatment Monitoring
Track response to therapies such as antibiotics, vasopressors, and ventilatory support. A declining SOFA score indicates clinical improvement.
โ๏ธ Prognostic Value
SOFA scores provide evidence-based mortality risk estimates that help guide goals of care discussions and resource allocation in the ICU.
๐ Sepsis Definition
The Sepsis-3 criteria define sepsis as a SOFA score increase of โฅ2 points in the presence of infection, standardizing diagnosis across institutions.
Frequently Asked Questions
What is a normal SOFA score?
A SOFA score of 0 indicates no organ dysfunction. Scores of 0โ6 are generally associated with low mortality risk (<10%). However, even a score of 0 may not mean the patient is healthy โ many critically ill patients have baseline organ dysfunction from their underlying condition. The SOFA score's greatest value lies in tracking changes over time rather than a single absolute value.
How is the SOFA score used in sepsis diagnosis?
According to the Sepsis-3 international consensus 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 of โฅ2 points consequent to the infection. A baseline SOFA score of 0 is assumed in patients without known pre-existing organ dysfunction. This definition replaced the older SIRS-based criteria, providing greater specificity for identifying patients with infection-related organ failure.
What is the maximum SOFA score and what does it mean?
The maximum SOFA score is 24 (4 points in each of 6 organ systems). A score of 24 represents the most severe degree of multi-organ failure across all systems. In-hospital mortality for patients with scores of 15 or higher exceeds 80%. However, individual patient outcomes depend on many factors including age, comorbidities, reversibility of the underlying condition, and the timeliness of medical interventions.
How often should the SOFA score be calculated?
The SOFA score is typically calculated daily in the ICU setting, often referred to as the "daily SOFA." Some clinicians calculate it every 24โ48 hours depending on clinical stability. The mean and highest SOFA scores during an ICU stay have both been shown to predict mortality. The trend is particularly important โ a decreasing SOFA score is associated with better outcomes, while an increasing score warrants escalation of care.
What is the difference between SOFA and qSOFA?
qSOFA (quick SOFA) is a simplified bedside screening tool that uses only 3 criteria: altered mental status (GCS <15), respiratory rate โฅ22/min, and systolic blood pressure โค100 mmHg. Each criterion scores 1 point (range 0โ3). qSOFA is used outside the ICU to identify patients at high risk of poor outcomes from suspected infection. SOFA, in contrast, is a comprehensive scoring system requiring laboratory values and is used in the ICU for detailed organ dysfunction assessment. Think of qSOFA as a rapid screening tool and SOFA as a definitive assessment.
Can the SOFA score be used for non-sepsis patients?
Yes, the SOFA score was originally developed to describe organ dysfunction in critically ill patients regardless of diagnosis. While it is most commonly associated with sepsis, it has been validated in diverse ICU populations including trauma, post-operative, cardiac, and medical ICU patients. The score's ability to track organ dysfunction over time makes it useful for any critically ill patient where assessment of multi-organ function is clinically relevant.
โ ๏ธ Important Medical Disclaimer: This SOFA Score Calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. The SOFA score is one of many clinical assessment tools and should be used as part of a comprehensive clinical evaluation by qualified healthcare professionals. Always consult a qualified healthcare provider with any questions about critical care management. Do not make clinical decisions based solely on the results from this calculator.