Sepsis Calculator - Sepsis-3 Organ Dysfunction Tally

The sepsis calculator applies the Sepsis-3 framework in one form: it sums the six SOFA sub-scores, applies the organ-dysfunction rule (SOFA 2 or more in suspected infection), and checks the two septic-shock criteria (vasopressor requirement plus serum lactate above 2 mmol/L).

• • ICU admission: An ICU team that needs the SOFA total and the sepsis or septic-shock flag in one calculation.
• • ED sepsis bundle: An ED nurse or physician activating the bundle of cultures, lactate, antibiotics, and 30 mL/kg crystalloid.
• • Sepsis coordinator audit: A sepsis coordinator reviewing which admitted patients triggered the sepsis or septic-shock criteria.
• • Teaching and case review: A trainee or fellow using the calculator to walk the team through the SOFA scoring.

For the patient who is outside the ICU and still needs a 0-3 bedside triage line, the qSOFA Calculator covers the same GCS, RR, and SBP sub-scores without requiring the full SOFA lab workup.

The calculator reads the three bedside qSOFA sub-scores and the six organ-system SOFA sub-scores, sums each into a 0-3 qSOFA total and a 0-24 SOFA total, and then applies the Sepsis-3 organ-dysfunction rule and the two septic-shock criteria using the vasopressor and lactate inputs.

• qsofaTotal: 0-3 sum of the three qSOFA sub-scores (GCS < 15, RR >= 22, SBP <= 100 mmHg).
• sofaTotal: 0-24 sum of the six SOFA sub-scores (respiration, coagulation, liver, cardiovascular, CNS, renal).
• vasopressors: 1 if a new vasopressor is required to maintain MAP at or above 65 mmHg after adequate resuscitation, otherwise 0.
• lactate: Serum lactate in mmol/L; the septic-shock threshold is strictly above 2 mmol/L.

According to Singer et al. JAMA 2016, sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection, identified in practice as an acute change of 2 points or more in the SOFA score, while septic shock is a subset of sepsis with persisting hypotension requiring vasopressors to maintain a MAP of 65 mmHg or higher and a serum lactate above 2 mmol/L after adequate volume resuscitation.

According to Seymour et al. JAMA 2016, the SOFA score discriminates in-hospital mortality across deciles of baseline risk with an AUROC of approximately 0.74 to 0.78.

When the bedside GCS is borderline (a GCS of 13 to 14) and you need the same eye-verbal-motor breakdown for the SOFA CNS sub-score, the Glasgow Coma Scale Calculator returns the published 3 to 15 total so the sepsis workup and the trauma workup stay in sync.

The Sepsis-3 framework splits sepsis into two layers (organ dysfunction and septic shock), and the SOFA score is the language both layers share.

When the respiratory SOFA sub-score is the largest contributor and the team needs the same PaO2/FiO2 number broken out of the arterial blood gas, the PaO2/FiO2 Ratio Calculator gives the ratio and the corresponding ARDS band that pairs with the SOFA workup.

Treat the calculator as a structured Sepsis-3 checklist: confirm infection, score the six SOFA sub-scores from the worst 24-hour ICU values, then read the sepsis and septic-shock flags.

1. 1 Confirm the suspected infection: Sepsis-3 starts with suspected or confirmed infection. The clinical team owns the infection workup that justifies entering the form.
2. 2 Score the six SOFA sub-scores: Use the worst 24-hour ICU values. The respiratory sub-score uses PaO2/FiO2 with support; the cardiovascular sub-score uses MAP and vasopressor dose in micrograms per kilogram per minute.
3. 3 Score the three qSOFA sub-scores: A GCS under 15, an RR of 22 or more, and an SBP of 100 mmHg or lower each contribute one point on the 0-3 scale.
4. 4 Record the vasopressor and lactate inputs: Score the vasopressor input as 1 only when a new vasopressor is started or up-titrated after the suspected infection. A lactate at or above 4 mmol/L is a Surviving Sepsis Campaign Hour-1 trigger.
5. 5 Read the flags and pair with the bundle: Sepsis criteria are met when the SOFA total is 2 or more. Septic shock criteria are met when sepsis criteria are met, vasopressors are required for MAP at or above 65 mmHg, and the serum lactate is above 2 mmol/L.

A 64-year-old with urosepsis. Worst 24-hour values: PaO2/FiO2 180, platelets 70, bilirubin 1.4, MAP 64, GCS 13, creatinine 2.1. qSOFA 2/3, SOFA 8/24, sepsis met, shock not met. Cultures, antibiotics, serial lactates, reassess in 30 to 60 minutes.

When the sepsis workup includes a basic metabolic panel and a lactate, the Anion Gap Calculator turns the panel into the serum and albumin-corrected anion gap so the team can rule in or out a metabolic acidosis on the same pass.

A clipboard can host the Sepsis-3 logic, but a calculator keeps the sub-scores traceable and standardizes the chart note.

• • Single-form Sepsis-3 workup: Returns the qSOFA total, the SOFA total, the sepsis criteria, and the septic-shock criteria from a single entry.
• • Traceable organ-by-organ scoring: Each SOFA sub-score is recorded with its source input, so a reviewer can challenge the score without re-measuring the patient.
• • Anchored in the Sepsis-3 paper: The flags trace back to Singer et al. JAMA 2016 and the Surviving Sepsis Campaign 2021 guidelines.
• • Hour-1 bundle prompt: The next-step line tells the team whether to activate the Hour-1 bundle (cultures, lactate, antibiotics, 30 mL/kg crystalloid, vasopressors).

When the patient stays in the ICU past the first 24 hours and the team needs a 0-163 severity score that adds age, chronic disease, and admission type, the SAPS II Calculator extends the sepsis workup into the full 1993 Le Gall mortality model.

Several clinical and workflow factors can move the SOFA total, the qSOFA total, or the septic-shock arm up or down without reflecting a real change in sepsis severity.

• • The Sepsis-3 framework is a prompt to consider sepsis and a tool to stage organ dysfunction, not a stand-alone diagnostic test. A SOFA below 2 does not rule out infection, and a qSOFA of 2 or 3 with a SOFA under 2 should trigger a recheck of the SOFA inputs, not a dismissal of the workup.
• • Inter-rater agreement on the CNS sub-score is moderate. A sedated, intubated, or aphasic patient can hide a GCS change, so the GCS input belongs in the chart note alongside the SOFA CNS sub-score.

According to Surviving Sepsis Campaign 2021, the SOFA score identifies organ dysfunction for the Sepsis-3 framework, but the bundle of lactate measurement, blood cultures, broad-spectrum antibiotics, and 30 mL/kg crystalloid for hypotension or lactate >= 4 mmol/L is what turns the sepsis flag into action at the bedside.

For the same ICU patient, severity-of-illness models such as the APACHE II Calculator provide a 0-71 total and a 1985 Knaus hospital-mortality band that runs alongside the Sepsis-3 organ-dysfunction workup.