Qsofa Score Calculator
Screen for sepsis outside the ICU using the quick SOFA bedside criteria. Enter values for instant results with step-by-step formulas.
Formula
qSOFA = (SBP<=100) + (RR>=22) + (GCS<15)
Each of the three criteria scores 1 point if met: systolic blood pressure 100 mmHg or below, respiratory rate 22 or above, and Glasgow Coma Scale less than 15. A total score of 2 or more is a positive screen for sepsis risk.
Worked Examples
Example 1: Emergency Department Screening
Problem: A 72-year-old patient presents with suspected urinary tract infection. Vitals: BP 88/52 mmHg, RR 26 breaths/min, GCS 14 (slightly confused). Calculate the qSOFA score.
Solution: Systolic BP = 88 mmHg (<=100): 1 point\nRespiratory Rate = 26 breaths/min (>=22): 1 point\nGCS = 14 (<15): 1 point\nTotal qSOFA = 3/3
Result: qSOFA Score: 3 (High Risk) — Immediate sepsis workup, blood cultures, IV antibiotics, and ICU consultation recommended
Example 2: General Ward Assessment
Problem: A 55-year-old post-surgical patient develops fever. Vitals: BP 118/76 mmHg, RR 20 breaths/min, GCS 15 (alert). Calculate the qSOFA score.
Solution: Systolic BP = 118 mmHg (>100): 0 points\nRespiratory Rate = 20 breaths/min (<22): 0 points\nGCS = 15 (=15): 0 points\nTotal qSOFA = 0/3
Result: qSOFA Score: 0 (Low Risk) — Continue standard monitoring; qSOFA does not rule out infection, consider clinical context
Frequently Asked Questions
What is the qSOFA score and when should it be used?
The quick Sequential Organ Failure Assessment (qSOFA) score is a bedside screening tool introduced as part of the Sepsis-3 consensus definitions in 2016. It is designed to identify patients outside the intensive care unit who are at risk for poor outcomes due to suspected infection. Unlike the full SOFA score, qSOFA requires no laboratory tests and can be calculated rapidly at the bedside using only three clinical parameters: systolic blood pressure, respiratory rate, and altered mental status assessed by the Glasgow Coma Scale. A score of two or more points suggests the patient may have sepsis and warrants further clinical investigation including blood cultures, lactate measurement, and consideration of early antibiotic therapy and fluid resuscitation.
How is the qSOFA score calculated and what are the criteria?
The qSOFA score ranges from 0 to 3 and assigns one point for each of the following criteria that is met: systolic blood pressure of 100 mmHg or less, respiratory rate of 22 breaths per minute or greater, and altered mental status defined as a Glasgow Coma Scale score below 15. Each criterion receives exactly one point, with no partial scoring or weighting. The score is considered positive for sepsis screening when two or more points are present. The simplicity of this scoring system is intentional, as it enables rapid assessment by any healthcare provider including nurses, paramedics, and physicians without requiring laboratory results or complex calculations. This makes it particularly valuable in emergency departments, general wards, and prehospital settings.
What is the sensitivity and specificity of the qSOFA score?
The qSOFA score has moderate specificity but relatively low sensitivity for predicting sepsis-related outcomes. Studies show a specificity of approximately 80-90 percent but sensitivity of only around 50-60 percent for in-hospital mortality. This means that while a positive qSOFA score (two or more) reliably identifies high-risk patients, a negative score does not rule out sepsis. Because of this limitation, the Surviving Sepsis Campaign 2021 guidelines recommend against using qSOFA as the sole screening tool for sepsis and suggest combining it with other clinical assessments and biomarkers such as procalcitonin and serum lactate levels. The qSOFA performs best as a prognostic tool rather than a diagnostic tool for identifying patients requiring escalated care.
How does qSOFA differ from the full SOFA score?
The full SOFA score evaluates six organ systems using both clinical and laboratory parameters: respiratory function via PaO2/FiO2 ratio, coagulation via platelet count, liver function via bilirubin level, cardiovascular function via mean arterial pressure and vasopressor requirements, central nervous system via Glasgow Coma Scale, and renal function via creatinine and urine output. Each system is scored from 0 to 4 for a maximum of 24 points. In contrast, qSOFA uses only three bedside parameters requiring no laboratory tests, making it much faster to calculate but less comprehensive. The full SOFA score is preferred for patients already in the ICU, while qSOFA serves as a rapid triage tool for patients on general wards or in emergency departments to prompt further evaluation.
Should clinical decisions be based solely on the qSOFA score?
No, clinical decisions should never rely exclusively on the qSOFA score. The tool is intended as a screening prompt to identify patients who may benefit from further sepsis workup, not as a standalone diagnostic criterion. A patient with a qSOFA score of zero or one may still have sepsis, particularly in early stages when vital signs have not yet deteriorated significantly. Conversely, elevated qSOFA criteria can occur in many non-sepsis conditions including heart failure, pulmonary embolism, stroke, and medication effects. Clinicians should integrate qSOFA results with complete clinical assessment, patient history, physical examination findings, and appropriate laboratory and imaging studies. Early lactate measurement and blood cultures remain essential components of the sepsis evaluation pathway regardless of the qSOFA result.
Does Qsofa Score Calculator work offline?
Once the page is loaded, the calculation logic runs entirely in your browser. If you have already opened the page, most calculators will continue to work even if your internet connection is lost, since no server requests are needed for computation.