qSOFA was introduced as part of the Sepsis-3 guidelines published in February 2016. SOFA is a well-known scoring system used in the ICU setting, and qSOFA is a simplified version that uses only 3 clinical criteria; altered mentation, tachypnea, and hypotension.
Why the change; the current SIRS Criteria is less sensitive and specific than the SOFA score. Utilizing 2 or more SIRS criteria was felt to be unhelpful by the 2016 task force,
Instead, qSOFA utilizes the most important criteria for those at risk for poor outcomes from sepsis.
Looking forward, remember that qSOFA is not a screening tool for sepsis, but a predictor of poor outcomes to help identify those patients who need additional providers and immediate interventions.