GGT — Liver + Alcohol Marker
GGT is a liver enzyme that may signal a liver or bile-duct problem when high; drinking alcohol raises it. It cannot name the cause, so it is read with other liver tests.
Gamma-glutamyl transferase (GGT) is an enzyme found mainly in the liver; a high level may signal a problem with the liver or bile ducts, and drinking alcohol raises it. The test cannot name the cause on its own, so it is read alongside ALT, AST and ALP.
Watch the 19-second version
GGT is a liver enzyme, and drinking alcohol raises it.
Transcript & sources → All videosMr. Age is AgeGen's editorial character. Facts come from the protocol above.
The biomarker
- Name: GGT (Gamma-Glutamyl Transferase)
- Units: U/L
- Standard reference range: 5–40 U/L for adults (ranges vary by lab)
How to read your result
| Value (U/L) | Interpretation |
|---|---|
| Within your lab's range | No GGT elevation — read together with the rest of your liver panel |
| Above your lab's range | May signal a liver or bile-duct problem; alcohol and some medicines raise GGT — the test cannot name the cause, so review it with your clinician |
| High GGT + high ALP | More likely a liver disorder than a bone disorder |
| Normal GGT + high ALP | More likely a bone disorder |
What to ask about
- Alcohol. Drinking alcohol raises GGT — tell your clinician how much you drink and ask whether a repeat test makes sense.
- Medication. Some medicines (for example phenytoin and phenobarbital) raise GGT — bring your medicine list.
- Clinician. Ask about further evaluation if GGT stays above your lab's range.
Why this test is worth asking for
- GGT is usually the first liver enzyme to rise when the bile ducts are obstructed, which makes it the most sensitive liver enzyme test for bile-duct problems.
- It is done with ALT, AST, ALP and bilirubin to tell liver or bile-duct disorders apart from bone disease: both GGT and ALP rise in bile-duct and liver disease, but only ALP rises in bone disease.
Related protocols
- Magnesium RBC — Cellular Magnesium Status Explained
- ALT and AST — Liver Enzymes
- Zinc — Immune Mineral Status
Sources
AgeGen lab guides are educational only. We do not provide medical diagnosis, prescribe brands, or recommend specific doses. Talk to a licensed clinician before changing your supplement or medication routine.
