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Kidney & liver
GGT
Clinical biomarkerLiver enzymeBloodU/L
A liver and biliary enzyme measured in routine blood testing.
What it measures
Gamma-glutamyl transferase activity in blood.
Why it matters
Used clinically in evaluation of hepatobiliary disease and can reflect alcohol or metabolic exposures.
How to interpret it
Interpret with other liver tests, medication/alcohol history and clinical context.
Important limitations
Nonspecific and should not be interpreted as a stand-alone longevity marker.
Evidence status
Clinical biomarker
Established clinical laboratory marker, with observational links to broader health outcomes.
Research & guidance
Original papers, validation studies, reviews and clinical guidance connected to this measurement.
For education and evidence exploration, not diagnosis or individualized medical advice.