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Brief Summary: Gamma-glutamyltransferase is a transferase that catalyzes the transfer of gamma-glutamyl functional groups from molecules such as glutathione to an acceptor that may be any amino acid, a peptide or water.   Technical Purpose: This test is often done with other tests that measure liver enzymes if there's a possibility of liver damage. Your doctor may order the GGT test if they suspect your liver is damaged or...