GPT and primary biliary cholangitis: However, APRI, similarly to other NITs, such as FIB-4, the AST/ALT ratio (AAR), and red blood cell distribution width to platelet ratio (RPR), has shown a suboptimal diagnostic performance (AUROC < 0.80) in predicting histological stage in the specific setting of PBC [188,189,190,191,192,193,194].