Gamma-glutamyl transferase (GGT) is an enzyme present throughout the body, with the highest concentrations in the liver. GGT plays a crucial role in glutathione metabolism, essential for antioxidant defense. It assists in transporting amino acids and peptides across cell membranes. Elevated GGT levels are commonly used as an indicator to detect liver damage, particularly bile duct obstructions and liver conditions associated with alcohol use.
High GGT levels can be caused by: