GPT and COVID-19: The biochemical parameters with increased levels in these severe COVID-19 patients include alanine transaminase (ALT), aspartate transaminase (AST), blood urea nitrogen (BUN), bilirubin, urea, creatine, amylase, lipase, procalcitonin, C-reactive protein (CRP), D-dimer, and lactate dehydrogenase (LDH).