GPT and Cirrhosis: Indirect laboratory indexes are calculated from routine laboratory data, and include the aspartate aminotransferase (AST) to alanine aminotransferase (ALT) ratio (AAR), the AST to platelet (PLT) ratio index (APRI), the cirrhosis discriminant score (CDS), the age-PLT index (API), the FIB-4 index (see below), Lok’s model and the red cell distribution width (RDW) to platelet ratio [9]–[11].