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GGT
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The Test Sample
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What is being tested?GGT is an enzyme found mainly in the liver; it is very sensitive to changes in liver function. It is normally present in low levels in the blood. When the liver is injured or obstructed, the GGT level rises. It is the most sensitive liver enzyme in detecting bile duct problems. A rise in GGT can occur even when there is no identifiable cause that is related to liver disease.
How is the sample collected for testing?
A blood sample is obtained by inserting a needle into a vein in the arm.
NOTE: If undergoing medical tests makes you or someone you care for anxious, embarrassed, or even difficult to manage, you might consider reading one or more of the following articles: Coping with Test Pain, Discomfort, and Anxiety, Tips on Blood Testing, Tips to Help Children through Their Medical Tests, and Tips to Help the Elderly through Their Medical Tests.
Another article, Follow That Sample, provides a glimpse at the collection and processing of a blood sample and throat culture.
Is any test preparation needed to ensure the quality of the sample?
GGT levels fall after meals, so it is best to be tested when you have not eaten for at least 8 hours.
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This article was last reviewed on
February 24, 2006.
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