GGT
What it measures, and what changes the number.
GGT (gamma-glutamyl transferase) is an enzyme found in cell membranes of many tissues. It is especially abundant in the liver and bile ducts. The test measures the activity of this enzyme in the blood.
GGT is usually part of a liver panel with ALT, AST, ALP and bilirubin. It is often read next to ALP, because together they help show whether a raised ALP comes from the liver or from bone.
GGT activity is influenced by alcohol intake and by a number of medicines that induce liver enzymes, so recent exposure can affect the result. Some labs prefer a fasting sample. Results are reported as enzyme activity, and the units and test temperature differ between methods. Reports may print it as Gamma-Glutamiltransferasa (GGT) or Gamma-glutamil transferasa (GGT).
Often read alongside: ALP, ALT, AST, Bilirubin (total), Bilirubin (direct)