Why get tested? To screen for liver disease and/or alcohol abuse or to differentiate between liver and bone disease as a cause for elevated alkaline phosphatase (ALP)
When to get tested? If your doctor thinks that you have symptoms of a liver disorder
Sample required? A blood sample drawn from a vein in your arm
Note: GGT levels fall after meals, so it is best to be tested when you have not eaten for at least 8 hours.
This article was last reviewed on February 24, 2006.
This page was last modified on April 8, 2009.
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