Zahra Khoshnegah - Dept. of Hematology and Blood Banking, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Mohammad Reza Keramati - Dept. of Hematology and Blood Banking, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Shirin Taraz Jamshidi - Dept. of Pathology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Mehdi Karimi-Shahri - Dept. of Pathology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
Samaneh Boroumand-Noughabi - Dept. of Hematology and Blood Banking, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran

Background and Objective: COVID-۱۹ has enforced high burden on health systems universally. To better allocate limited health equipment, we aimed to investigate the prognostic impacts of laboratory parameters. Materials and Methods: All SARS-CoV-۲ patients admitted to Imam-Reza University Hospital, Mashhad, Iran, during three COVID۱۹ peak periods in Iran (March to April ۲۰۲۰, July to August, and October to November ۲۰۲۰) were enrolled the study. Demographic and laboratory data were extracted and compared between survivors and non-survivors. Regression analyses and receiver operating characteristic (ROC curve) were used to identify risk factors and assess the ability of laboratory tests in predicting in-hospital mortality. Results: A total of ۲۱۵۶ COVID۱۹ patients were included in the analysis, with a mean age of ۶۰.۲۰ (±۱۸.۸) years. Most patients were male (۵۷%). Multiple regression analysis identified older age (OR=۱.۰۱), male sex (OR=۲.۳۴), lymphopenia (OR=۲.۱۲), LDH >۵۰۰U/L (OR=۲.۱۷), hypernatremia (OR=۹.۷), urea >۴۵mg/dL (OR=۳.۶), and BS >۲۰۰mg/dl (OR=۱.۹۳) as significant risk factors for in-hospital death. Using ROC curve analysis, D-dimer (>۱۰۰۰ng/ml) as well as CK-Mb (>۲۸U/L) both with sensitivities and specificities of more than ۸۰% and PPV of about ۹۰% were able to identify patients with higher possibility of in-hospital death. Conclusion: Male sex, older age, lymphopenia, hypernatremia, increased Urea, increased LDH, and hyperglycemia may serve as potential risk factors for in-hospital death. D-dimer and CK-MB may be used in identifying patients with high probability of in-hospital death. These tests may be used in clinical decision-making in order to improve outcomes of patients with COVID-۱۹.

COVID-۱۹, Laboratory tests, Mortality, Prognosis, Risk factors, SARS-CoV-۲