GGT Blood Test Explained: What This Liver Marker Reveals

Gamma-glutamyl transferase, commonly called GGT, is a liver enzyme measured in routine blood testing. While often associated with liver health, GGT can also reflect broader metabolic processes.

Why Liver Health Matters

The liver plays a central role in metabolism, detoxification and energy regulation. According to the Australian Institute of Health and Welfare, liver disease has increased in Australia over recent decades, particularly due to metabolic conditions.

What GGT Measures

GGT is an enzyme involved in the metabolism of glutathione, one of the body’s key antioxidant systems.

Elevated GGT levels may indicate liver stress or increased oxidative activity.

Expert Insight

Professor Jeremy Nicholson, a pioneer in metabolic health research, has described GGT as: “A sensitive marker of metabolic stress and liver function.”

Why Context Matters

GGT is often interpreted alongside other liver markers including:

• ALT

• AST

• ALP

• Bilirubin

Tracking Results

Monitoring liver markers across multiple blood tests can provide insight into liver and metabolic health patterns.