SOFA score calculator

The Sequential Organ Failure Assessment score, known as SOFA, grades six organ systems from zero to four and adds those integers to a total from zero to twenty-four. Intensive-care teaching, sepsis research, and worksheet authors use it to summarise respiration, coagulation, liver, cardiovascular, central-nervous-system, and renal status from a short panel of bedside and laboratory values. This capability implements the published Vincent tables as a pure function: you send a PaO2/FiO2 ratio, a platelet count, a bilirubin, a cardiovascular hypotension category, a Glasgow Coma Scale, and a creatinine, and you receive each organ subscore together with the summed total. A value outside its clinical range is rejected with invalid input rather than being clipped or guessed.

How the SOFA score is defined

SOFA is the Sequential Organ Failure Assessment published by Vincent and colleagues and later adopted as the organ-dysfunction limb of the Sepsis-3 definitions. The published rule grades six systems independently from zero to four and sums them, with no age term, no weighting, and no lactate. Respiration uses the PaO2/FiO2 ratio in millimetres of mercury: four hundred or greater scores zero, below four hundred scores one, below three hundred scores two, below two hundred scores three, and below one hundred scores four.

Coagulation uses the platelet count in thousands per microlitre, with cutoffs at one hundred fifty, one hundred, fifty, and twenty. Liver uses total bilirubin in milligrams per decilitre, with cutoffs at 1.2, 2.0, 6.0, and 12.0.

Cardiovascular uses the published hypotension ladder rather than mean arterial pressure alone: no hypotension scores zero, mean arterial pressure below seventy millimetres of mercury scores one, dopamine at five micrograms per kilogram per minute or less or any dobutamine scores two, dopamine above five or epinephrine or norepinephrine at 0.1 or less scores three, and dopamine above fifteen or epinephrine or norepinephrine above 0.1 scores four.

Central nervous system uses the Glasgow Coma Scale: fifteen scores zero, thirteen to fourteen scores one, ten to twelve scores two, six to nine scores three, and three to five scores four. Renal uses serum creatinine in milligrams per decilitre, with cutoffs at 1.2, 2.0, 3.5, and 5.0. Adding the six integers produces a total from zero through twenty-four.

A total of two or greater is commonly taught as organ dysfunction in the Sepsis-3 sense, not as a diagnosis and not as a replacement for qSOFA, NEWS2, or a clinician. This capability implements those inclusive published thresholds exactly. It does not convert bilirubin to micromoles, does not ingest urine output, and does not apply SIRS heart-rate or white-cell criteria.

Inputs must be finite and inside the clinical range declared for each field. A Glasgow Coma Scale of sixteen cannot represent that scale and fails with invalid input rather than being silently clipped to fifteen. Always frame outputs as educational scores from the published SOFA tables, not as a clinical diagnosis or a substitute for professional judgment, continuous monitoring, or local treatment protocols.

Where SOFA calculators show up in real work

Critical-care education, nursing orientation, and physician-assistant courses constantly assign SOFA drills from textbook laboratory panels, so a single trusted oracle that returns the integer beside each organ subscore speeds grading and demo setup. Simulation centres and electronic worksheet products want a documented six-parameter path that clients can audit by hand rather than a black-box risk model that mixes lactate, white cells, and urine output without disclosure.

Research assistants preparing synthetic ICU datasets need stable SOFA labels from known panels without network calls or model drift, and they need a hard reject when a Glasgow Coma Scale arrives outside three to fifteen so dirty extracts cannot masquerade as scores. If you later need the three-point qSOFA bedside screen, NEWS2, SIRS, APACHE, or a urine-output renal limb, treat those as separate search intents and landings rather than overloading this Sequential Organ Failure Assessment page.

Always present results as educational estimates from the published six-system tables; clinical decisions require qualified professionals, a suspected-infection context this tool does not collect, and protocols that may escalate care when the score is two or greater. Keep requests small, pin the integer score and the six component points in tests, and you get reproducible SOFA figures for homework, LMS plugins, and edge workers without standing up a clinical information system of your own.