• Test Code - PL0336
  • Test Name - Gamma-Glutamyl Transferase (GGT)
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Test Details & Preparation


  • Gamma-Glutamyl Transferase (GGT) test is done to evaluate for a possible liver disease or bile duct disease or to differentiate between liver and bone disease as a cause of elevated alkaline phosphatase (ALP) sometimes to screen for or monitor alcohol abuse.

  • Gamma-Glutamyl Transferase (GGT) test is performed when you have symptoms of a liver or bile duct disorder or as follow up when you have an increased ALP level.

  • A blood sample drawn from a vein in your arm for a Gamma-Glutamyl Transferase (GGT) test.

  • GGT levels fall after meals you may be instructed to fast (nothing to eat or drink except water) for at least 8 hours prior to the test. You may also be asked to stop drinking alcohol or taking certain prescription medications.

  • An elevated GGT level suggests that something is damaging the liver but does not indicate specifically what. In general, the higher the level, the greater damage to the liver.

  • Elevated GGT levels may be due to liver diseases, such as hepatitis or cirrhosis, but they may also be due to other conditions, such as congestive heart failure, diabetes, or pancreatitis. They may also be caused by alcohol abuse or use of drugs that are toxic to the liver.

  • A low or normal GGT test result indicates that it is unlikely that a person has liver disease or has consumed any alcohol.

  • A high GGT level can help rule out bone disease as the cause of an increased ALP level, but if GGT is low or normal then an increased ALP is more likely due to bone disease.


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