In particular, regarding liver involvement, a systematic review and meta-analysis of 128 studies showed that, in COVID-19 patients admitted to hospital, the most common liver abnormalities consisted of elevations of gamma-glutamyl-transferase (GGT, 28%) alanine aminotransferase (ALT, 23%), and aspartate aminotransferase (AST, 23%). Here, GPT is linked to COVID-19.