I. How to Use
When to Use
The score can be used on all patients admitted to the ICU. It is also applicable to patients in non-ICU settings to evaluate for ICU admission, pediatric patients (pSOFA), and neonates (nSOFA).
Pearls / Pitfalls
The score is calculated on admission to the emergency department and then every 24 hours using the lowest score in a 24-hour period. The baseline SOFA score should be assumed to be zero unless the patient has known preexisting organ dysfunction. Serial SOFA measurements (every 24 hours) provide superior prognostic information compared to a single score on admission.
The SOFA score has several important limitations that can affect its accuracy and clinical utility. When the score was designed in 1996, it was created to describe organ dysfunction at a population level. Therefore, using it for individual clinical decision-making is problematic and a constraint of the score.
The SOFA score lacks age-appropriate criteria for pediatric and neonatal populations. Variables like creatinine and the PaO₂/FiO₂ ratio can vary significantly with age, making the adult SOFA unsuitable for the pediatric population without adaptation. Although pediatric and neonatal SOFA scores have been developed and validated across many studies, they use different criteria which creates challenges for congruent application across age groups.
Finally, the score requires updating to reflect modern critical care practices such as new organ support modalities (such as drugs and devices) or biomarkers for earlier detection of dysfunction. After nearly 30 years of application the SOFA-2 score has been published and addresses some of these limitations of the original score.The SOFA-2 score incorporates modern organ support therapies such as vasopressors, noninvasive ventilation and renal replacement therapy. Given that these modalities were not available in 1996, SOFA-2 presents revised thresholds to better reflect current critical care practice.
Why Use
The SOFA score is a validated tool used to determine the level of organ dysfunction in critically ill patients with or without sepsis thereby establishing mortality risk. It is one of the most commonly used scores for ICU patients and has been utilized and studied for nearly thirty years. Additionally, SOFA demonstrates superior prognostic power to determine hospital mortality compared to alternative criteria such as SIRS.
The SOFA score can also be used as a criterion for diagnosing sepsis. Under the Sepsis-3 criteria, sepsis is defined as a suspected infection combined with an acute increase in SOFA score of 2 or more points from baseline, which indicates life-threatening organ dysfunction.
II. Next Steps
Advice
If utilizing SOFA scores in ICU patients, it is important to establish a baseline as soon as the patient presents to the unit. That baseline will be in place to assess changes in the score over the progression of the disease.
Management
The information gathered from a SOFA score can be used to track disease progression, assess mortality risk, provide prognosis for patients and their family members, quality assessment, and data for clinical trials.
Critical Actions
The SOFA score does not validate the success or failure of a therapy and thus should not be used to influence medical management.
III. Evidence
Evidence Appraisal
Originally developed by the Working Group on Sepsis-Related Problems of the European Society of Intensive Care Medicine (ESICM) in 1996, the SOFA score was created to describe the severity of organ dysfunction over time.
The clinical utility of the score was first validated by Vincent et al. (1998). By analyzing data across 40 international ICUs, the authors demonstrated that the real value of SOFA lay in its serial, daily application. It was noted that serial SOFA scoring enabled enhanced monitoring of disease trajectory and that high SOFA scores were associated with increased mortality. This was further confirmed by Ferreira et al. (2001), whose prospective study of 352 patients showed that a rising SOFA score within the first 48 hours of admission was a poor prognostic indicator, correlating with mortality rates exceeding 50%.
A pivotal shift occurred in 2016 when the Sepsis-3 Task Force (Singer et al.) moved away from the traditional SIRS criteria, which were criticized for being too sensitive and non-specific. By incorporating SOFA into the formal definition of sepsis, they established that an acute change of greater than 2 points from baseline was the most accurate way to define a dysregulated host response. Their data indicated that this threshold identifies patients with an in-hospital mortality risk of approximately 10%.
Recent large-scale studies have confirmed these findings in broader populations. Soo et al. (2019) utilized a massive cohort of over 20,000 Canadian patients to validate the score’s performance in real-world, high-volume critical care settings, confirming that SOFA remains a robust and superior tool for discriminating mortality risk compared to earlier screening methods.
Formula
Addition of the selected points:
*Estimating FiO₂ from oxygen flow/delivery rate:
Facts & Figures
Interpretation:
Literature
Vincent JL, Moreno R, Takala J, Willatts S, De Mendonça A, Bruining H, et al. The SOFA (Sepsis-related Organ Failure Assessment) score to describe organ dysfunction/failure. On behalf of the Working Group on Sepsis-Related Problems of the European Society of Intensive Care Medicine. Intensive Care Med. 1996 Jul;22(7):707-10.
Ferreira FL, Bota DP, Bross A, Mélot C, Vincent JL. Serial evaluation of the SOFA score to predict outcome in critically ill patients. JAMA. 2001 Oct 10;286(14):1754-8.
Singer M, Deutschman CS, Seymour CW, Shankar-Hari M, Annane D, Bauer M, et al. The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA. 2016 Feb 23;315(8):801-10.
Soo A, Zuege DJ, Fick GH, Niven DJ, Berthiaume LR, Stelfox HT, et al. Describing organ dysfunction in the intensive care unit: a cohort study of 20,000 patients. Crit Care. 2019 May 23;23(1):186.
Lambden S, Laterre PF, Levy MM, Francois B. The SOFA score-development, utility and challenges of accurate assessment in clinical trials. Crit Care. 2019 Nov 27;23(1):374.
Yealy DM, Mohr NM, Shapiro NI, et al. Early care of adults with suspected sepsis in the emergency department and out-of-hospital environment: a consensus-based task force report. Ann Emerg Med. 2021 Jul;78(1):1-19.
Moreno R, Rhodes A, Ranzani O, Salluh JIF, Berger-Estilita J, Coopersmith CM, et al. Rationale and methodological approach underlying the development of the Sequential Organ Failure Assessment (SOFA)-2 score: a consensus statement. JAMA Netw Open. 2025;8(10):e2545040.