GPT and End Stage Liver Disease: These include the serum aspartate aminotransferase to alanine aminotransferase ratio (AST/ALT ratio), the Aspartate Aminotransferase to platelet ratio index (APRI) score, the Fibrosis-4-scores (FIB), the Forns Index, and the “Model for End-stage Liver disease” (MELD) score (31, 32).