Objectives: Sepsis is acute organ dysfunction in the setting of infection. An accurate diagnosis is important to guide treatment and disposition. Tissue oxygen saturation (StO2) can be estimated noninvasively by near-infrared spectroscopy (NIRS), and may be an indicator of microcirculatory dysfunction in early sepsis. We aimed to determine the utility of StO2 for sepsis recognition and outcome prediction among patients presenting to the emergency department (ED) with infection. Patients and methods: A multicentre, prospective, observational cohort study recruited patients who were being admitted to hospital with infection. StO2 was measured in the ED using a handheld NIRS device, Inspectra 300. Outcomes were sepsis, defined as an increase in sequential organ failure assessment score of at least 2 points within 72 h, and composite in-hospital mortality/ICU admission at least 3 days. Results: A cohort of 323 participants, median age 64 (interquartile range: 47-77) years, was recruited at three Australian hospitals. 143 (44%) fulfilled the criteria for sepsis and 22 (7%) died within 30 days. The mean+/-SD StO2 was 74+/-8% in sepsis and 78+/-7% in nonsepsis (P
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