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Gamma glutamyl transferase (GGT or GGTP, or Gamma-GT) () is a liver enzyme. It is involved in the transfer of amino acids across the cellular membrane and in glutathione metabolism. GGT is found in high concentrations in the liver, bile ducts and kidney. The enzyme is also present in other tissues, such as the epididymis. Its level in the blood may be tested for, as an elevated level may indicate an abnormality in the liver, though this can be caused by a number of conditions including:
Its levels are increased in chronic and acute alcohol abuse.
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