qSOFA Score
Quick Sequential Organ Failure Assessment Score · Also known as: Quick SOFA, qSOFA
The Quick Sequential Organ Failure Assessment (qSOFA) score, introduced by the Sepsis-3 taskforce in 2016, is a rapid 3-variable bedside screening tool for identifying non-ICU patients at high risk of sepsis-related mortality. It uses altered mentation, systolic hypotension, and tachypnea to quickly stratify patients without requiring laboratory testing.
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When to use it
qSOFA is used for rapid bedside screening in non-ICU settings to identify patients at risk of sepsis-related mortality. It is particularly valuable in emergency departments, general hospital wards, urgent care, and primary care when sepsis is in the differential. qSOFA is not used in patients already known to be critically ill (ICU patients); the full SOFA score is preferred in those settings.
Strengths & limitations
- Extremely rapid assessment requiring no equipment or laboratory testing; can be performed in seconds at triage
- Three objective variables that are readily observable by any clinician
- Strong prognostic value: qSOFA ≥ 2 predicts higher mortality than SIRS criteria alone
- Can be applied consistently across diverse settings (ED, wards, primary care)
- No special training required; healthcare workers at all levels can perform assessment
- Lower sensitivity than full SOFA; qSOFA ≤ 1 does not exclude sepsis, particularly in young patients or those without obvious organ dysfunction
- Does not address the underlying infection; a high qSOFA score warrants investigation for infection but does not confirm infection
- Variables are subject to confounding: hypotension may be from medications or dehydration, tachypnea from pain or anxiety, altered mentation from sedation
- Blood pressure and respiratory rate thresholds are somewhat arbitrary and may not apply equally across age groups or comorbidities
- qSOFA was derived in non-ICU populations; its use in ICU requires full SOFA assessment
Frequently asked
Can I use qSOFA to diagnose sepsis?
No. qSOFA is a screening tool for identifying high-risk patients, not a diagnostic criterion. Sepsis diagnosis requires documented or suspected infection plus evidence of organ dysfunction (via SOFA or other markers). A high qSOFA warrants investigation for infection and organ dysfunction, but does not diagnose sepsis alone.
What should I do if qSOFA is high?
If qSOFA ≥ 2, obtain blood cultures, measure lactate, perform imaging (chest X-ray, abdominal ultrasound, or CT as indicated), and discuss with an infectious disease or critical care specialist. If infection is suspected, initiate empiric antibiotics without delay. Do not wait for culture results.
If qSOFA is ≤ 1, can I be sure the patient doesn't have sepsis?
No. qSOFA has high specificity but lower sensitivity; a low score does not exclude sepsis, especially in younger patients or those with compensatory physiology. Clinical judgment is essential. If you suspect infection, pursue further investigation regardless of qSOFA.
How does qSOFA differ from SOFA?
qSOFA is a rapid 3-variable bedside screening tool for non-ICU settings; SOFA is a comprehensive 6-organ system score for daily assessment in hospitalized or ICU patients. qSOFA guides initial recognition, while SOFA tracks organ dysfunction severity and response to treatment.
Sources
- Singer, M., Deutschman, C. S., Seymour, C. W., et al. (2016). The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA, 315(8), 801-810. DOI: 10.1001/jama.2016.0287 ↗
- Seymour, C. W., Liu, V. X., Iwashyna, T. J., et al. (2017). Assessment of clinical criteria for sepsis: for the Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3). JAMA, 315(8), 762-774. DOI: 10.1001/jama.2016.0288 ↗
How to cite this page
ScholarGate. (2026, June 3). Quick Sequential Organ Failure Assessment Score. ScholarGate. https://scholargate.app/en/clinical-assessment/qsofa
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
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