GPT and COVID-19: In addition to routine tests in the determination of progression and fatal complications in COVID-19 patients, it is recommended to use CRP because it is parallel with LDH, D-dimer, ALT, AST and IL6.15,16 Ponti et al.17 stated that high AST, ALT, total bilirubin, LDH, D-dimer, CRP, WBC and low lymphocyte values were associated with progression.