Liver function (LFTs)
GGT blood test: what a high result means
What a GGT (gamma GT) result means, why GGT can be raised, and what to ask your doctor.
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Explain my results → Available on web, iOS & Android.What is GGT?
GGT, or gamma-glutamyl transferase, is an enzyme found mainly in the liver and bile ducts. It is often included in the liver function tests (LFTs). GGT is very sensitive, so it rises with many things that affect the liver, including alcohol and some medicines. It is also used to work out whether a raised ALP is coming from the liver or the bones.
Why is this test done?
- As part of liver function tests
- To help find the source of a raised ALP
- To check for liver effects of alcohol
- To monitor liver conditions
What does a high GGT mean?
A raised GGT shows that something is affecting the liver or bile ducts, but on its own it does not say what.
Possible reasons include:
- Alcohol, even in moderate amounts
- Fatty liver disease
- Some medicines, such as some anti-seizure medicines
- Bile duct problems, such as gallstones
- Other liver conditions
- Smoking and obesity
What does a low GGT mean?
A low GGT is not considered a problem.
Why we don't list a "normal range". Reference ranges differ between laboratories and can depend on your age, sex and whether you are pregnant. The range printed next to your result on your own report is the one that applies to you, so use that, and talk to your doctor about what your result means for you.
What can affect your GGT result?
- Alcohol in the weeks before the test
- Medicines, especially some anti-seizure medicines
- Body weight
- Smoking
Make sense of the whole report, not just one line
Results are easier to understand together. Patiently AI explains your report as a whole and writes personalised questions for your next appointment.
Try it with your own results → Paste, upload or photograph your results.Questions to ask your doctor
- What might be raising my GGT?
- Should I cut down on alcohol, and would that change the result?
- Are my other liver tests normal?
- When should it be rechecked?
Frequently asked questions
Does a high GGT mean I drink too much?
Alcohol is a common cause, but not the only one. Fatty liver, medicines, smoking and bile duct problems can all raise GGT. Your doctor will consider the whole picture.
How long does GGT take to come down after stopping alcohol?
GGT usually falls over several weeks after cutting down or stopping alcohol, if alcohol was the cause.
Why test GGT with ALP?
ALP can come from the liver or bones. If GGT is raised as well, the ALP is probably coming from the liver.
Can Patiently AI explain my GGT result?
Yes. Paste your results, or upload a photo, PDF or Word file, and Patiently AI explains them in plain English, sticking to the numbers and ranges on your own report rather than adding its own, and suggests questions to ask your doctor. It is free, needs no account, and removes identifying details on your device first.