GAMMA GLUTAMYL TRANSFERASE; GGT

What this test checks

Measures GGT, an enzyme that rises with alcohol use, certain medicines, and blockage of bile ducts.

Why do people get this test?

Useful when other liver tests are mildly off and the cause is unclear — particularly to confirm if alcohol is contributing.

When you should consider this test

• Mildly raised liver enzymes
• Heavy alcohol use evaluation
• Suspected bile duct problem

How to prepare

Avoid alcohol for at least 24 hours before.