What does the SOFA score measure?

SOFA quantifies the degree of dysfunction across six organ systems — respiratory, coagulation, hepatic, cardiovascular, neurological, and renal. Each is scored 0 to 4, giving a total from 0 to 24, where higher numbers mean more severe organ failure.

How does SOFA relate to sepsis?

Under the Sepsis-3 definition, sepsis is suspected or confirmed infection plus an acute rise of 2 or more SOFA points from the patient's baseline. So a change in score, not just the absolute value, is what defines sepsis.

What mortality does a given score predict?

Mortality rises steeply with score. Roughly, a total under 7 carries a low risk while a total above 11 is associated with very high mortality. These bands are study-dependent estimates and should never replace individual clinical judgement.

Is a single SOFA score enough?

Trends matter more than a snapshot. A SOFA score that climbs over successive days signals worsening organ failure, while a falling score suggests recovery. Daily scoring during an ICU stay is the intended use.

What values should I enter for the cardiovascular system?

Use the mean arterial pressure and any vasopressor doses. A MAP of 70 or above with no pressors scores 0, a MAP below 70 scores 1, and progressively higher pressor requirements score 2 to 4 according to the published cut-offs.

SOFA Score Calculator (Sequential Organ Failure Assessment)

The Sequential Organ Failure Assessment, or SOFA, is the standard bedside score for tracking multi-organ dysfunction in critically ill patients. It underpins the Sepsis-3 definition and helps intensivists follow a patient’s trajectory day by day. This calculator scores all six organ systems and returns the total with an approximate mortality band, computed in your browser.

How it works

Each of six organ systems is scored from 0 (normal) to 4 (most severe) using the published cut-offs, then summed:

total = respiration + coagulation + liver
      + cardiovascular + CNS + renal   (each 0–4, total 0–24)

Respiration uses the P/F ratio, coagulation uses the platelet count, liver uses bilirubin, cardiovascular uses mean arterial pressure and vasopressor dose, CNS uses the Glasgow Coma Scale, and renal uses creatinine or urine output. The dropdowns map your selection straight to the correct subscore.

Example and notes

A ventilated septic patient with a P/F of 150 (3), platelets of 80 (2), bilirubin of 2.5 mg/dL (2), needing low-dose noradrenaline (3), a GCS of 13 (1), and a creatinine of 2.2 mg/dL (2) scores a total of 13 — a high score associated with substantial mortality. Crucially, Sepsis-3 hinges on a rise of 2 or more points from baseline, so always compare against the admission or pre-illness score. Mortality bands here are approximate and study-dependent; the trend over successive days is far more informative than any single value.