A healthy result should fall into the range 0 - 38 U/L, or 0.00 - 38.00 IU/L.

Gamma-glutamyl transpeptidase (GGT) is an enzyme found in many body tissues, the most notable being the liver. A GGT test may be used to determine the cause of elevated alkaline phosphatase (ALP). GGT and ALP are both elevated in disease of the bile ducts and in some liver diseases, but only ALP will be elevated in bone disease. Comparing the two test results can help determine if liver or bone disease is the cause of abnormal enzyme levels. For this reason, a GGT test is often run alongside other tests when a liver issue is suspected, such as: ALP, ALT, AST, and bilirubin tests, to differentiate between liver disease, bile duct disorders, and bone disease. Some signs and symptoms of liver damage include:

            -Weakness, fatigue

            -Loss of appetite

            -Nausea and vomiting

            -Abdominal swelling / pain

            -Jaundice (yellowing of the skin / eyes)

            -Dark urine, light-colored stool


Alcohol abuse is also known to affect GGT levels; therefore, GGT tests are sometimes ordered to monitor alcohol-dependency treatments and compliance with treatment programs in those with a history of alcohol abuse.

GGT result calculator

insert the value from you GGT test result.

What does it mean if your GGT result is too low?

A low or normal GGT test indicates that liver damage in unlikely or the person hasn’t consumed any alcohol recently.

It is worth noting that use of clofibrate and oral contraceptives can decease GGT levels. 

What does it mean if your GGT result is too high?

An elevated GGT level indicates that something is damaging the liver but does not indicate specifically what. Generally, the higher the GGT level the greater the damage to the liver.  Therefore, a high GGT level typically warrants further testing. Elevated levels may be due to liver diseases (such as hepatitis or cirrhosis), or they may be due to other conditions (such as congestive heart failure, diabetes, or pancreatitis). As mentioned above, alcohol abuse and smoking can also cause elevated GGT, as well as drugs that are toxic to the liver, including: phenytoin, carbamazepine, and barbiturates. In addition, use of many other prescription and non-prescription drugs, including NSAIDs, lipid-lowering drugs, antibiotics, stomach acid reducers, antifungal agents, antidepressants, and testosterone can increase GGT levels.

It is worth noting that GGT levels increase with age in women, but not in men, and are always somewhat higher in men than in women. 

Upload Full Test and Learn More

To learn more, visualize and track your test results, create a personal account.

Sign Up, Upload Tests, Get Insights and Improve with HealthMatters.io.

Sign up now.

Are you concerned about your blood test results?
Then get your personal health dashboard.


Personal Plan +

Unlimited Tests Upload Subscription
Cancel anytime

Sign Up


Personal Plan Basic

Single test upload.
Pay for each test result upload.

Upload Now

Your Privacy And Security

At HealthMatters, we're committed to maintaining the security and confidentiality of your personal information. We've put security measures in place to help protect against the loss, misuse or alteration of information under our control. We use procedural, physical and electronic security methods designed to prevent people who aren't authorized from getting access to this information. Our internal code of conduct adds additional privacy protection. See our Privacy Policy for more information.