GPT and fatty liver disease: These noninvasive diagnostic methods include aspartat aminotransferase (AST) to platelet ratio index (APRI), fibrosis index based on 4 factors (FIB-4) score (based on AST, alanin aminotransferase (ALT), patient age, and platelet count), AST/ALT ratio (AAR), red blood cell distribution width (RDW) to platelet ratio (RPR), mean platelet volume, and cytokeratin-18.[4,9–11] However they are mainly used for chronic viral liver disease and fatty liver disease.