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. The neutrophil-to-lymphocyte ratio (NLR) as calculated from the white cell differential blood count is a marker that has been used as a prognostic index when assessing patients suffering from several clinical syndromes, including sepsis. The aim of this study was to evaluate the relationship between NLR and the commonly used severity scores of sepsis SOFA, APACHE II and SAPS II in a population of emergency admitted adult patients with sepsis in a tertiary center. Methods . A prospective observational study was conducted in the Emergency Department of the University Hospital of Patras, Greece, based on data extracted from 50 patients consecutively enrolled, suffering from sepsis of multiple origin. The study period was from May 01, 2017 until June 30, 2017. The NLR was calculated from the total white blood cell (WBC) count values measured from a peripheral venous blood specimen drawn on admission. C-reactive protein (CRP) was also measured. The sepsis severity prognostic scores APACHE II, SAPS II and SOFA were calculated for each patient. Results . NLR was positively correlated with the sepsis severity prognostic scores on admission (SOFA, r s  = 0.497, p &lt; 0.001; APACHE II, r s  = 0.411, p = 0.003; SAPS II, r s  = 0.445, p = 0.001). Total WBC was also significantly correlated with the scores (SOFA, r s  = 0.342, p = 0.015; APACHE II, r s  = 0.384, p = 0.006; SAPS II, r s  = 0.287, p = 0.043). Serum CRP did not show any significant correlation either to NLR or to the sepsis severity scores on admission. Conclusions . NLR is an easily calculated, cost-efficient index that could be used as a tool for clinicians when assessing sepsis patients in the Emergency Department. Although NLR measurement is simple, and rapidly available, future and larger prospective studies are warranted to confirm its definite value as a prognostic index in sepsis patients.

Correlation between neutrophil-to-lymphocyte ratio and severity scores in septic patients upon hospital admission. A series of 50 patients