GGT (gamma-glutamyl transferase) is a liver enzyme that is very sensitive to alcohol and to blocked bile ducts.
- Normal range (adults)
- Men 7–56 U/L · Women 7–45 U/L
- Sample
- Blood
- Fasting
- Not usually needed
- Also called
- Gamma GT, Gamma Glutamyl Transferase, GGT, Gamma-Glutamyl Transpeptidase, GGTP
GGT normal range
| Group | U/LSame unit in all countries |
|---|---|
| Men | 7–56 |
| Women | 7–45 |
Ranges vary slightly between laboratories. The range printed on your own report is the one to go by.
Why is the GGT test done?
It helps confirm that a raised ALP comes from the liver, and is used to detect alcohol-related liver stress.
What does a high GGT level mean?
A high GGT means the liver or bile ducts are under strain. It rises with regular alcohol use and some medicines, and is linked to fatty liver and heart risk.
Common causes
- Alcohol, even moderate regular drinking
- Fatty liver
- Bile duct blockage or gallstones
- Medicines such as anti-epileptics
- Overweight and diabetes
Diet and lifestyle tips
- Stop alcohol; GGT usually falls within a few weeks
- Lose weight if needed
- Cut sugar and fried foods
- Eat vegetables, fruit, whole grains and legumes
When should you see a doctor?
Discuss with your doctor, especially if ALP is also high or you have abdominal pain or jaundice.
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This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.