Gamma Glutamyl Transferase (GGT) or Gamma GT is an enzyme that is found mainly in the liver, but it may also be found in the kidney, biliary tract, heart, brain, intestine, pancreas and the spleen. It is a sensitive indicator of hepatobiliary disease (obstructive jaundice, intrahepatic cholestasis or pancreatitis). Abnormal levels of GGT can be found in Alcoholism, Brain tumours, Diabetes, Gallbladder disease or other diseases of the biliary system, Heart attack, Liver diseases such as hepatitis, cirrhosis, or cancer, Mononucleosis, or Pancreatitis. In your case, it appears to be due to alcohol related damage to the liver. Complete abstinence from alcohol o visit to a gastroenterologist is advisable.