GPT and COVID-19: The comparison of the oxidative stress marker (LDH) in COVID-19 patients revealed that the subjects with LDH values lower than 544 U/L were young male and presented lower levels of D-dimer, AST, ALT, glucose, CRP, and creatinine, as well as lower levels of leukocytes, neutrophils, NLR, and FIB-4 (Table 4).