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Previous Volume 330:1832-1833 June 23, 1994 Number 25 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Gamma-glutamyltransferase (GGT) is a glycoprotein enzyme that catalyzes the transfer of the gamma-glutamyl group from gamma-glutamyl peptides to other peptides and to l-amino acids. The activity of GGT in the kidney is very high; there is lower activity in the liver and pancreas. Patients with cholestasis usually have increased serum GGT concentrations, and the concentrations may be increased by certain enzyme-inducing drugs or alcohol abuse^1,2,3. Measurements of serum GGT aid in interpreting elevated serum alkaline phosphatase values, since patients with skeletal disease have normal serum GGT values. GGT activity in serum is the sum of the . . . [Full Text of this Article]

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