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SOFA in Sepsis: Count All Six Systems and Compare With Baseline

Quick Medical Calculator Editorial Team · Reading label 1 September 2026 · 2 min read

Retrospective study sequence, not publication date

The original SOFA score describes dysfunction in six organ systems. Sepsis-3 uses an acute increase of at least two points attributable to infection, not simply an absolute total of two in anyone who might have an infection. Sepsis-3 consensus.

Check Completeness First

The six systems are respiratory, coagulation, liver, cardiovascular, central nervous system, and renal. Platelets, neurological assessment, and kidney function must not disappear from a shortened table. Respiratory support and vasoactive treatment are part of relevant definitions. Vasopressor doses require units and duration context, not bare numbers. Original SOFA publication; Sepsis-3 scoring table.

Worked Original-SOFA Case

For a fictional complete assessment, suppose the relevant values in the assessment window are:

Total = 2 + 2 + 1 + 0 + 0 + 2 = 7

If documented preinfection dysfunction contributed 2 points, the increase is 7 - 2 = 5, not 7. Deciding whether the change is consequent to infection still requires clinical assessment. A missing baseline is not automatically normal when pre-existing organ dysfunction is known. Sepsis-3 baseline convention.

Do Not Turn qSOFA Into a Gate

qSOFA is a different bedside prompt. A low qSOFA cannot safely end a sepsis assessment. The 2026 Surviving Sepsis Campaign recommends other established screening tools over qSOFA alone in acutely ill hospital patients. Urgent evaluation and treatment should not wait for every laboratory component of SOFA. SCCM 2026 adult guidance.

Name the Version

SOFA-2 was developed and validated in 2025 to update organ-dysfunction assessment. The example above deliberately uses the original SOFA framework employed in Sepsis-3. Do not mix original and SOFA-2 thresholds in a total or assume that publication of a new prognostic score automatically changes every local sepsis definition. SOFA-2 development study.

For serial comparisons, document the version, observation window, support being delivered, and any untestable or missing values. A changing score is a useful description, not proof that a specific treatment caused improvement.