Gamma-glutamyl transferase

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Also known as: GGT
Formal name: Gamma-glutamyl transferase

At a Glance

Why Get Tested?

To screen for liver disease or alcohol abuse; and to help your doctor tell whether a raised level of alkaline phosphatase (ALP) is due to liver or bone disease

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

Test Preparation Needed?

GGT levels may fall after meals so it is best to be tested when you have not eaten for 8 hours.

The Test Sample

What is being tested?

GGT is an enzyme found mainly in the liver and is normally present in low levels in the blood. When the liver is injured or the flow of bile is obstructed, the GGT level rises. It is therefore a useful marker for detecting bile duct problems.

How is the sample collected for testing?

A blood sample is obtained by inserting a needle into a vein in the arm.

Is any test preparation needed to ensure the quality of the sample?

GGT levels may fall after meals so it is best to be tested when you have not eaten for 8 hours.

The Test

Common Questions

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NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.