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You are here : 3-RX.com > Medical Encyclopedia > Tests and Exams > Gamma-Glutamyl Transferase

Gamma-Glutamyl Transferase

Alternate Names : GGT, Gamma-Glutamyltranspeptidase, GGTP

Overview & Description | Preparation & Expectations | Results and Values

Gamma-glutamyltransferase, also known as GGT, is an enzyme that is found mainly in the liver. But it may also be found in the:

  • kidney
  • biliary tract
  • heart
  • brain
  • intestine
  • pancreas
  • spleen
  • Who is a candidate for the test?

    GGT levels are measured when a doctor suspects there is damage or disease in the liver or the biliary system.

    How is the test performed?

    In order to measure the amount of GGT in the blood, a blood sample is taken from a vein on the forearm or hand. First, the skin over the vein is cleaned with an antiseptic. Next, a rubber tube called a tourniquet is tied around the upper arm. This enlarges the veins in the lower arm by restricting blood flow through them. A fine needle is gently inserted into a vein, and the tourniquet is removed. Blood flows from the vein through the needle and is collected in a syringe or vial for testing in the laboratory. After the needle is withdrawn, the puncture site is covered for a short time to prevent bleeding.


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    Gamma-Glutamyl Transferase: Preparation & Expectations

    Author: Melinda Ratini, DO, MS
    Reviewer: Kathleen A. MacNaughton, RN, BSN
    Date Reviewed: 06/13/02

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