GPT and COVID-19: The mean ALT level in severe COVID-19 patients was higher than in mild disease (37.87 ± 32.17 vs. 21.22 ± 12.67), and the mean total bilirubin level was higher in severe COVID-19 disease than in mild disease (14.12 ± 6.37 vs 10.27 ± 4.26, P < .001).