The Gamma GT (GGT) test is a highly sensitive measure of your liver and bile duct health. GGT is an enzyme in the liver that, when elevated, is a key early indicator of liver damage or a blockage in the bile ducts. It is often measured alongside other liver enzymes (like ALP) to pinpoint the cause of a problem, and it is particularly sensitive to alcohol-related liver stress. This test requires a simple blood draw. It’s an essential part of a comprehensive liver workup, providing a vital, early-warning sign.