Source:http://linkedlifedata.com/resource/umls/id/C0151662
NCI: A finding based on laboratory test results that indicate higher than normal levels of the enzyme gamma-glutamyltransferase in the blood specimen. GGT (gamma-glutamyltransferase ) catalyzes the transfer of a gamma glutamyl group from a gamma glutamyl peptide to another peptide, amino acids or water.,NCI: Increase in the level of the enzyme gamma-glutamyltransferase in the blood, which catalyzes the transfer of a gamma glutamyl group from a gamma glutamyl peptide to another peptide, aminoacids, or water.