• İshak Şan, Emin Gemcioğlu, Mehmet Davutoğlu, Ramis Çatalbaş, Berkan Karabuğa, Enes Kaptan, Abdulsamet Erden, Orhan Küçükşahin, İhsan Ateş, Selma Karaahmetoğlu, İmran Hasanoğlu, Osman İnan, Büşra Nur Ünal, Ecem Erdemir, Fatih Ahmet Kahraman, and Rahmet Güner.
• Department of Emergency, Faculty of Medicine, University of Health Sciences, Ankara, Turkey.
• Turk J Med Sci. 2021 Dec 13; 51 (6): 281028212810-2821.

Background/AimCoronavirus 2019 disease (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is a pandemic infectious disease that causes morbidity and mortality. As a result of high mortality rate among the severe COVID-19 patients, the early detection of the disease stage and early effective interventions are very important in reducing mortality. Hence, it is important to differentiate severe and nonsevere cases from each other. To date, there are no proven diagnostic or prognostic parameters that can be used in this manner. Due to the expensive and not easily accessible tests that are performed for COVID-19, researchers are investigating some parameters that can be easily used. In some recent studies, hematological parameters have been evaluated to see if they can be used as predictive parameters.Materials And MethodsIn the current study, almost all hematological parameters were used, including the neutrophil/lymphocyte ratio, platelet/lymphocyte ratio, monocyte/lymphocyte ratio, mean platelet volume to lymphocyte ratio, mean platelet volume to platelet ratio, plateletcrit, and D-dimer/fibrinogen ratio, neutrophil/lymphocyte/platelet scoring system, and systemic immune-inflammation index. A total of 750 patients, who were admitted to Ankara City Hospital due to COVID-19, were evaluated in this study. The patients were classified into 2 groups according to their diagnosis (confirmed or probable) and into 2 groups according to the stage of the disease (nonsevere or severe).ResultsThe values of the combinations of inflammatory markers and other hematological parameters in all of the patients with severe COVID-19 were calculated, and the predicted values of these parameters were compared. According to results of the study, nearly all of the hematological parameters could be used as potential diagnostic biomarkers for subsequent analysis, because the area under the curve (AUC) was higher than 0.50, especially for the DFR and NLR, which had the highest AUC among the parameters.ConclusionOur findings indicate that, the parameters those enhanced from complete blood count, which is a simple laboratory test, can help to identify and classify COVID-19 patients into non-severe to severe groups.This work is licensed under a Creative Commons Attribution 4.0 International License.

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