GPT and cholestasis: The most commonly measured liver biomarkers include alanine aminotransferase (ALT) and aspartate aminotransferase (AST), which are markers of hepatocyte injury; alkaline phosphatase (ALP), which can be a marker of biliary disease and cholestasis; bilirubin, gamma-glutamyl transferase (GGT) and albumin which are marker of parenchymal liver disease or biliary obstruction [10].