Objectives: We aimed to investigate the relationship between the neutrophil/lymphocyte ratio (NLR) and clinical characteristics of acute allergic reaction patients diagnosed in an emergency clinic Material and methods: The medical records of the patients with a diagnosis of acute allergic reaction that presented to were included in the study. The age, gender, NLR, white blood count, eosinophil, MPV, glucose, and platelet count of all participants were recorded. The study included 100 allergy

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... ients and 100 healthy controls. The demographic and the clinical characteristics of the groups were compared by statistical analysis. Results: The mean age, gender, lymphocyte count, eosinophil count, platelet count, and MPV were similar in the two groups (p > 0.05 for all). The mean NLR values of the allergy and the control group were 4.36 and 2.12, respectively (p = 0.008). Moreover the serum glucose levels were significantly higher in allergy group compared to the control group (p < 0.001). Conclusions: Patients with acute allergic reaction had a significantly higher value of NLR. Thus, NLR may be a useful diagnostic indicator of allergic conditions.