Doctors use the gamma-glutamyl transferase (GGT) blood test to diagnose liver problems. High levels of GGT can indicate damage to the liver or bile ducts, or other conditions.
A typical range for GGT levels in adults and children is between 0 and 50 international units per liter (IU/L).
With the GGT test, a healthcare professional measures the levels of GGT in a sample of blood. When GGT falls within the typical range, it suggests that there is no liver damage.
Read on to learn more about the GGT test, including its purpose, what it involves, and what abnormal GGT ranges can mean.