Sofa Score Calculator - Sepsis-3 0-24 Organ Failure Tally

The sofa score calculator sums six 0-to-4 Sepsis-3 sub-scores (respiratory, coagulation, liver, cardiovascular, CNS, and renal) into a 0-to-24 total. The 2016 Sepsis-3 consensus operationalizes sepsis as an acute change of 2 or more points from baseline consequent to suspected or documented infection, so the total is one data point for clinician interpretation, not a stand-alone diagnosis.

• • Sepsis-3 review: Summarizing the 0-24 SOFA total in an adult with suspected infection, where the Sepsis-3 label also requires a baseline SOFA and clinical confirmation of infection.
• • ICU daily trend: Tracking the score at the morning hand-off so a rising total over 24 to 48 hours flags possible worsening organ function.
• • Sepsis coordinator audit: Reviewing which admitted patients met the Sepsis-3 threshold during their stay so the lactate, blood culture, and antibiotic timing are documented in the chart.

The original SOFA score was developed by Vincent and colleagues in 1996, and the 2016 Sepsis-3 consensus reused the same 0-to-24 total as the numerical anchor for the sepsis definition.

At the bedside in the emergency department and on the ward, the Q Sofa Calculator is the 0-3 screen that flags a patient for a full Sepsis-3 review.

The calculator reads nine clinical inputs, scores each organ system against the Sepsis-3 thresholds, and sums the six sub-scores into a 0-24 total. The Sepsis-3 organ-dysfunction definition also requires an acute change of 2 or more points from baseline and a clinical context of suspected or documented infection, which this tool does not capture.

• PaO2 / FiO2: Arterial PaO2 over FiO2. Sepsis-3 bands 400+, 300-399, 200-299, 100-199 with ventilation, and below 100 with ventilation are 0, 1, 2, 3, and 4 points.
• Platelets and bilirubin: Platelets in 10^3 per microliter (150+, 100-149, 50-99, 20-49, below 20) and total bilirubin in mg/dL (below 1.2, 1.2-1.9, 2.0-5.9, 6.0-11.9, 12.0+) are 0 to 4 points.
• MAP and vasopressors: MAP below 70 with no vasopressor is 1. Dopamine at or below 5 or dobutamine is 2. Higher-dose dopamine, epinephrine, or norepinephrine is 3 or 4.
• GCS: Glasgow Coma Scale total. Bands 15, 13-14, 10-12, 6-9, and below 6 are 0, 1, 2, 3, and 4 points.
• Creatinine and urine output: Creatinine below 1.2, 1.2-1.9, 2.0-3.4, 3.5-4.9, and 5.0+ are 0 to 4. Urine below 500 mL/day forces 3 and below 200 forces 4. RRT also scores 4.

The cardiovascular sub-score uses the vasopressor category directly when an agent is running. The renal sub-score carries an override: urine below 500 mL per day forces 3 and below 200 mL per day forces 4, and renal replacement therapy also scores 4.

According to Vincent et al. 1996 Intensive Care Medicine, the SOFA score sums six organ systems for a 0-to-24 total that tracks organ dysfunction over the ICU stay.

According to Singer et al. JAMA 2016, sepsis is operationalized as an acute SOFA change of 2 or more points consequent to suspected or documented infection.

For a published ICU mortality estimate at the morning hand-off, the SAPS II Calculator pairs the 0-24 Sepsis-3 total with the 0-163 SAPS II logit from the 1993 Le Gall model.

Each Sepsis-3 sub-score captures one organ-system sign of decompensation, and the 0-24 total is one input to the sepsis definition alongside the baseline and infection context.

The score is meant to be tracked as a daily trend. A rising total over 24 to 48 hours is the early signal that organ function may be worsening, and the chart note should record the raw values so the baseline change is auditable.

For an admission risk review that includes chronic health and the acute physiology score, the APACHE II Calculator is the most common companion to the Sepsis-3 score on a 24-hour ICU admission.

Treat the calculator as a bedside chart-review checklist: pull the inputs, score each organ system against the Sepsis-3 table, and read the 0-24 total before paging the ICU team. The Sepsis-3 label also needs the baseline SOFA and a clinical assessment of suspected or documented infection, so the total is one input to interpretation.

1. 1 Pull the inputs from the chart: Open the most recent arterial blood gas, CBC, metabolic panel, MAP, GCS, and 24-hour urine output from the flow sheet.
2. 2 Score the respiratory sub-score: Divide PaO2 by FiO2 and apply the Sepsis-3 bands 400+, 300-399, 200-299, 100-199 with ventilation, and below 100 with ventilation.
3. 3 Score the coagulation and liver sub-scores: Use the platelet count and total bilirubin from the same lab draw.
4. 4 Score the cardiovascular sub-score: Pick the Sepsis-3 vasopressor category, or use MAP if no vasopressor is running.
5. 5 Score the CNS and renal sub-scores: Sum the GCS sub-scores. For renal, start with creatinine and apply the urine output override.
6. 6 Read the total and the threshold indicator: Sum the six sub-scores on the 0-24 scale. A total of 2 or more sits at the Sepsis-3 threshold; the clinical label is only met when the baseline change and infection are documented.

A 72-year-old with community-acquired pneumonia. P/F 240, platelets 145, bilirubin 1.1, MAP 65, no vasopressors, GCS 14, creatinine 1.3, urine 1200. Sub-scores: respiratory 2, coagulation 1, liver 0, cardiovascular 1, CNS 1, renal 1, total 6. The total sits at the Sepsis-3 threshold; the sepsis label depends on the baseline change and a clinical assessment of infection.

For a ward deterioration trend, the MEWS Score Calculator tracks the 0-14 MEWS total from respiratory rate, heart rate, systolic blood pressure, temperature, and AVPU.

A calculator for the Sepsis-3 score keeps the sub-scoring rules at the bedside and standardizes the chart note. The chart note still needs the baseline SOFA and the infection context.

• • Tied to the Sepsis-3 framework: The 0-24 total and the 2-point threshold match the 2016 Sepsis-3 consensus, and the chart note also records the baseline change and infection context.
• • Standardized sub-scoring rules: Each organ system is scored against the published Sepsis-3 bands, so a trainee and an attending see the same total.
• • Daily trend ready: A 2-point rise over 24 to 48 hours is the early signal that organ function may be worsening and the chart note should be re-read alongside local protocol.
• • Documented chart note: The sub-scores and the total are recorded together, so a later reviewer can audit the inputs and the baseline change.

When the liver sub-score climbs, the MELD Calculator reads the same bilirubin, creatinine, and INR inputs into the MELD total that drives transplant and ICU triage.

Clinical and workflow factors can move the score up or down without reflecting a real change in organ failure, and a few are carved out of the Sepsis-3 validation cohort.

• • The score is a structured organ-failure tool, not a stand-alone diagnostic test for sepsis. The Sepsis-3 label also requires a 2 or more point change from baseline and suspected or documented infection, so the total is one input to local protocols.
• • The Sepsis-3 thresholds are integers, so a patient one point below a band looks the same as one well below it. The chart note should record the raw value so the next assessment can audit the change against the baseline.

The Sepsis-3 score was derived from 148,907 encounters in the validation cohort. The score should not be the only sepsis tool; qSOFA, MEWS, SAPS II, and APACHE II add a different lens, and the local protocol sets the management pathway.

According to Surviving Sepsis Campaign 2021, the SOFA score is the recommended organ-failure tool in the ICU and a change of 2 or more points consequent to infection is the operational definition of sepsis.

When the CNS sub-score is high because of a primary neurological event, the NIH Stroke Scale Calculator adds the 0-42 NIHSS total that quantifies the stroke deficit.