About This qSOFA Score Calculator
The qSOFA Score Calculator (Quick Sepsis Related Organ Failure Assessment) is a rapid clinical screening aid introduced in the Sepsis-3 guidelines (2016). Unlike the full SOFA score which requires laboratory data, qSOFA relies solely on clinical examination findings, making it quick to apply in emergency departments, general wards, and pre-hospital settings. Because of its low sensitivity, the 2021 Surviving Sepsis Campaign advises against using it as a single screening tool.
How to Use This Calculator
Assess the patient for the presence of the following three clinical signs. Assign one point for each abnormal finding:
- Hypotension: Is the Systolic Blood Pressure ≤ 100 mmHg?
- Altered Mental Status: Is the Glasgow Coma Scale (GCS) < 15? (Any alteration from baseline alertness).
- Tachypnea: Is the Respiratory Rate ≥ 22 breaths per minute?
Clinical Interpretation
The total score ranges from 0 to 3. The Sepsis-3 task force described a cutoff of ≥ 2 points to identify higher-risk patients.
- Score 0-1: Low Risk. The patient does not meet the qSOFA high-risk threshold. However, qSOFA has low sensitivity, so a score below 2 does not exclude sepsis; continue to monitor and investigate if sepsis is suspected.
- Score 2-3: High Risk. The patient is at significantly increased risk of in-hospital mortality and prolonged ICU stay. This should trigger:
- Prompt assessment for evidence of organ dysfunction (e.g., Lactate, full SOFA score).
- Consideration for escalation of care or transfer to ICU.
- Initiation of sepsis bundles if infection is confirmed.
Important (2021 Surviving Sepsis Campaign): qSOFA should not be used as the sole screening tool for sepsis because of its low sensitivity (~46%). Use it together with SIRS, NEWS, or MEWS and lactate measurement, guided by clinical judgment.
Frequently Asked Questions (FAQ)
1. What is the difference between SOFA and qSOFA?
SOFA is a comprehensive scoring system used in the ICU to grade organ dysfunction over time; it requires lab results (bilirubin, creatinine, platelets, ABG). qSOFA is a simplified “screening” version that uses only 3 vital signs/exam findings to quickly flag at-risk patients outside the ICU.
2. Can qSOFA diagnose sepsis?
No. qSOFA is a risk stratification tool, not a diagnostic test. It identifies patients with infection who are likely to have poor outcomes. The diagnosis of sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection (operationalized by an acute increase in total SOFA score ≥ 2).
3. Should qSOFA be used as a single sepsis screening tool?
No. The 2021 Surviving Sepsis Campaign guidelines recommend against using qSOFA as a single screening tool because of its low sensitivity (around 46%). It is specific but insensitive, so a negative qSOFA does not rule out sepsis. It should be combined with other tools such as SIRS, NEWS, or MEWS plus lactate measurement and clinical judgment.
4. Does altered mental status just mean GCS < 15?
Yes, for the purpose of qSOFA, any score less than 15 (even GCS 14) counts as a point. This includes any new onset of confusion, disorientation, or drowsiness.
5. Should I wait for labs before using qSOFA?
No. The main advantage of qSOFA is that it requires no laboratory tests. It can be performed immediately at the bedside or even by EMS personnel.
Related Calculators
📖 Sources:
- Singer M, Deutschman CS, Seymour CW, et al. The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA. 2016;315(8):801–810. PMID: 26903338.
- Seymour CW, Liu VX, Iwashyna TJ, et al. Assessment of Clinical Criteria for Sepsis (Sepsis-3). JAMA. 2016;315(8):762-774. PMID: 26903335.
- Evans L, Rhodes A, Alhazzani W, et al. Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021. Crit Care Med. 2021;49(11):e1063-e1143. PMID: 34605781.
- Freund Y, Lemachatti N, Krastinova E, et al. Prognostic Accuracy of Sepsis-3 Criteria for In-Hospital Mortality Among Patients With Suspected Infection. JAMA. 2017;317(3):301–308. PMID: 29099342.
⚠️ Disclaimer:
This tool is for informational and educational purposes only and is not a substitute for professional clinical judgment. All treatment decisions must be made by a qualified healthcare professional considering the individual patient’s full clinical context.
