Dogan, SerdarBal, TayibeCabalak, MehmetDikmen, NurselYaqoobi, HasibullahOzcan, Oguzhan2024-09-182024-09-1820210250-46851303-829Xhttps://doi.org/10.1515/tjb-2021-0013https://search.trdizin.gov.tr/tr/yayin/detay/492739https://hdl.handle.net/20.500.12483/9194Objectives: The aim of this study was to evaluate the relationship between systemic oxidative balance, and the severity of the disease in patients with COVID 19. Methods: Sixty-four patients were divided into three groups according to the severity of the disease: mild (n=28), moderate (n=11) and severe (n=25). Twenty-four healthy controls included to the study. Proinflammatory cytokines (IL-6 and TNF-alpha), D-dimer, fibrinogen, total oxidative status (TOS), total antioxidant status (TAS) were measured and oxidative stress index (OSI) was calculated. Results: The mean age of severe group was significantly higher than the other groups (p=0.001). TAS levels were significantly decreased in all patient groups compared to controls, while serum TOS and OSI levels were significantly different in all three stages of the disease. Serum IL-6 and TNF-alpha levels were significantly elevated in severe group compared to other groups. TOS and OSI levels were also significantly correlated with IL-6, CRP, ferritin, fibrinogen, LDH and D-dimer. Conclusions: TOS and OSI levels are an indicator of systemic oxidative balance in COVID-19 and related to the disease severity. They can be an important marker for evaluating the disease severity and used in the management of patients with COVID-19.eninfo:eu-repo/semantics/openAccessCOVID-19IL-6OSIoxidative stressTOSArticle46434935710.1515/tjb-2021-00132-s2.0-85116262428Q3492739WOS:000693607700003Q4