Elevated GGT levels may be caused by liver disease, congestive heart failure, or alcohol, to name a few. Elevated levels off GGT may indicate liver damage, although it does not indicate the mechanism of injury.
Test Preparation For Optimal Results:
It is best to be fasting for approximately 9-12 hours prior to lab collection (without food or liquids except water).
Disclaimer: A health care provider should evaluate a deviation from normal ranges.