Background and Aim:The novel coronavirus (SARS-CoV-2) that causes novel coronavirus pneumonia (COVID-19) is the third fatal coronavirus. The prognosis of disease varies depending on patient’s specialties. The aim of this study was to evaluate the correlation of CBC parameters and ferritin levels at the time of diagnosis with the prognosis of patients hospitalized due to COVID 19. Materials and Methods: In this retrospective study, 1320 patients hospitalized at the Aksaray University Training and Research Hospital between July 2020 and December 2020 were evaluated. Results: All of the patients were hospitalized because of symptoms associated with COVID 19. There were 688 males and 632 females with a median age of 70 (19-98) at the time of hospitalization with COVID 19 symptoms. The median follow-up time was 7 (range, 1-57) days in hospital for all patients. Median age was significantly higher in patients who do not respond to treatment and have mortality (p<0.001). Most of the patients with mortality were males (p=0.001). There was a statistically significant difference in the parameters other than monocyte and basophil among the hemogram parameters checked at the time of presentation. Neutrophil / lymphocyte ratio was significantly higher in patients with mortality (p<0.001). Conclusion: In conclusion, this study indicates that by using the most simple and routine hematological tests at the time of COVID-19 diagnosis, it may be possible to predict a patient’s prognosis. This will help patients receive early clinical care, reducing patient mortality and aiding in the control and prevention of the outbreak.