Gamma GT (GGT) blood test
Quick answer: A GGT test measures an enzyme found mainly in the liver and bile ducts. It helps doctors look into liver and bile duct problems and can be raised by alcohol and some medicines.
- SampleBlood
- TakesAbout 5 minutes
- Before the testYour doctor may ask you to avoid alcohol for a day or more before the test.
How the test is done
- 1You may be asked to avoid alcohol for a day before, as your doctor advises
- 2The inside of your elbow is cleaned
- 3A needle draws blood into a tube
- 4The lab measures GGT, often with other liver tests
What your results can mean
Reading your report
Normal ranges differ between labs and by age and sex, so discuss your result with your doctor.
If the result is outside the usual range
A high level can be seen with liver disease, blocked bile ducts, regular alcohol use, fatty liver and some medicines. A normal GGT with a high ALP points more towards bone than liver.
Who usually has this test
People with suspected liver or bile duct problems, people with raised ALP, and people whose alcohol use is being monitored.
Risks and aftercare
There may be a little bruising, which usually fades without treatment.
Names and options
Also called: GGT, gamma glutamyl transferase
Listed by the hospital as
- GAMMA GT, SERUM
Questions about this test
Does alcohol raise GGT?
Yes. Regular drinking can raise GGT, and it may take a few weeks to come down after cutting back.
Can medicines raise GGT?
Yes. Some seizure medicines and other drugs can raise it. Tell your doctor what you take, but do not stop anything without advice.
Why is GGT checked with ALP?
Both rise with bile duct problems, but only ALP rises with bone conditions. Together they help find the source.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.