qSOFA Calculator
Calculate the qSOFA (quick SOFA) score for sepsis screening using systolic blood pressure, respiratory rate, and mental status. Free clinical tool with component breakdown, risk interpretation, and chart.
About This Calculator
The qSOFA (quick Sequential Organ Failure Assessment) score is a rapid bedside screening tool for identifying patients at high risk of sepsis-related mortality. Developed by the Sepsis-3 Task Force and published in JAMA in 2016, qSOFA simplifies the full SOFA score to just three clinical criteria that can be assessed in under a minute without any laboratory tests. It is designed for use in emergency departments, general wards, and other non-ICU settings where healthcare providers need to quickly identify potentially septic patients who require urgent intervention.
The qSOFA score assigns 1 point for each of three criteria: systolic blood pressure of 100 mmHg or less (indicating hypotension), respiratory rate of 22 breaths per minute or higher (indicating tachypnea), and altered mentation defined as a Glasgow Coma Scale (GCS) score of less than 15 (indicating decreased consciousness). The total score ranges from 0 to 3 points. A score of 2 or more is associated with a significantly increased risk of death or prolonged ICU stay, prompting immediate clinical assessment, blood cultures, lactate measurement, and initiation of the Surviving Sepsis Campaign one-hour bundle (broad-spectrum antibiotics, crystalloid fluid resuscitation, and vasopressors if needed).
While the qSOFA score is a valuable prompt, it has known limitations including low sensitivity; the earlier SIRS criteria (Systemic Inflammatory Response Syndrome) may be better for initial screening in some settings. The qSOFA should never replace clinical judgment — it is a risk stratification aid, not a diagnostic test. Patients with suspected infection but qSOFA scores below 2 still require careful monitoring, particularly if clinical suspicion for sepsis remains high. This calculator is intended for healthcare professionals and educational reference only. Always consult a qualified medical professional for clinical decisions.
Regional Notes: In India, the Indian Society of Critical Care Medicine (ISCCM) incorporates qSOFA in sepsis screening protocols across emergency departments. In the United States, the Centers for Medicare and Medicaid Services (CMS) SEP-1 core measure and the Surviving Sepsis Campaign guidelines reference qSOFA for early sepsis identification. In the United Kingdom, the National Institute for Health and Care Excellence (NICE) guidelines for sepsis recognition recommend qSOFA as part of the clinical assessment toolkit alongside NEWS2 scoring.
Frequently Asked Questions
What is the qSOFA score?
The qSOFA (quick Sequential Organ Failure Assessment) score is a simplified sepsis screening tool introduced by the Sepsis-3 Task Force in 2016. It uses three clinical criteria — systolic blood pressure of 100 mmHg or less, respiratory rate of 22 breaths per minute or higher, and altered mentation (GCS less than 15) — to identify patients at high risk of sepsis-related mortality. Each criterion scores 1 point for a total range of 0 to 3.
What does a qSOFA score of 2 or higher mean?
A qSOFA score of 2 or higher indicates a high risk of sepsis-related mortality and prolonged ICU stay. The Third International Consensus Definitions for Sepsis (Sepsis-3) recommends using qSOFA as a simple bedside prompt to identify infected patients outside the ICU who are likely to be septic. A score of 2 or more warrants urgent clinical assessment, blood cultures, lactate measurement, broad-spectrum antibiotics, and fluid resuscitation per the Surviving Sepsis Campaign guidelines.
How is the qSOFA score calculated?
The qSOFA score is calculated by assigning 1 point for each of three criteria: systolic blood pressure 100 mmHg or less (1 point), respiratory rate 22 breaths per minute or higher (1 point), and altered mentation defined as Glasgow Coma Scale less than 15 (1 point). The total score ranges from 0 to 3. A score of 0 indicates low risk, while 2 or more indicates high risk of poor outcomes from sepsis.
Can qSOFA be used for children?
The qSOFA score was originally validated in adult populations and is most commonly used in adult emergency departments and general wards. For pediatric patients, the Phoenix Sepsis Score and other pediatric-specific scoring systems are recommended. The qSOFA criteria thresholds (SBP 100 mmHg, RR 22/min) may not be appropriate for children, as normal vital signs vary significantly by age.
How does qSOFA compare to SIRS criteria?
The qSOFA score was introduced to replace the SIRS (Systemic Inflammatory Response Syndrome) criteria, which the Sepsis-3 Task Force found to be too sensitive and non-specific. qSOFA is more specific for predicting sepsis-related mortality but less sensitive than SIRS for screening. While SIRS requires meeting two of four criteria (temperature, heart rate, respiratory rate, white blood cell count), qSOFA uses only three bedside clinical assessments, making it faster and easier to use in non-ICU settings.
Is the qSOFA score used in India, US, and UK hospitals?
Yes, the qSOFA score is used globally in hospitals across India, the United States, and the United Kingdom. In India, it is recommended by the Indian Society of Critical Care Medicine (ISCCM) for sepsis screening in emergency departments. In the US, the Surviving Sepsis Campaign and CMS (Centers for Medicare and Medicaid Services) incorporate qSOFA in sepsis protocols. In the UK, the National Institute for Health and Care Excellence (NICE) guidelines reference qSOFA as a tool for identifying sepsis risk in acute settings.
What are the limitations of the qSOFA score?
The qSOFA score has several limitations. It has low sensitivity (approximately 54%) for identifying sepsis, meaning it can miss some patients with infection who may deteriorate. It was designed for non-ICU settings and may perform differently in ICUs where full SOFA scoring is preferred. The criteria rely on accurate vital sign measurement and mental status assessment. qSOFA should be used as a screening tool, not a standalone diagnostic test, and clinical judgment should always guide management decisions.
What is the difference between SOFA and qSOFA?
The full SOFA (Sequential Organ Failure Assessment) score evaluates six organ systems — respiratory, cardiovascular, hepatic, coagulation, renal, and neurological — with each scored from 0 to 4 for a maximum of 24 points. It requires laboratory tests including PaO2, platelet count, bilirubin, and creatinine. The qSOFA (quick SOFA) simplifies this to just three clinical criteria — blood pressure, respiratory rate, and mental status — requiring no lab tests and taking under a minute to assess. qSOFA is designed for rapid bedside screening in non-ICU settings.