Introduction: Clinical picture of Coronavirus disease-2019 (COVID-19) ranges from mild respiratory symptoms to severe respiratory failure and death. To determine the severity of the disease; lymphocyte count, lactate dehydrogenase (LDH), C-reactive protein (CRP), D-dimer and interleukin-6 (IL-6) levels are the parameters that are used. In this study, it was aimed to evaluate effect of LDH/lymphocyte ratio on prognosis and whether there was a correlation between LDH/lymphocyte ratio and IL-6 in hospitalized patients with COVID-19. Materials and Methods: Patients who were aged 18 years and older, were positive for Severe acute respiratory syndrome-Coronavirus-2 polymerase chain reaction test, had COVID-19 pneumonia findings on tomography, and hospitalized for at least three days were included in the study. Results: The mean age of the patients was 59.35±15.23 year and 56 (59.6%) of patients were male. Fifty seven (60.6%) of the patients had comorbid diseases. The 14- and 28-day mortality rates were 14.9% and 27.7%, respectively. There was a statistically significant correlation between hospitalization in intensive care unit and LDH, lymphocyte count, LDH/lymphocyte ratio, CRP, highest D-dimer, initial IL-6, neutrophil/lymphocyte ratio, and highest IL-6 values (p
