GPT and COVID-19: Approximately 50% of COVID-19 hospitalised patients exhibit abnormal levels of alanine transaminase (ALT) and aspartic transaminase (AST), slightly elevated level of bilirubin, higher alveolar-arterial oxygen gradient (A-aDO2)/gamma-glutamyl transferase (GGT), and hypoalbuminemia that suggests hepatic damage (80–82).