Blood Test Guide

GGT (Gamma-GT) Test

Name: GGT Blood Test (Gamma-GT): Normal Range & Liver Health
Creator: Suman Konda
Published: 2026-07-05

GGT is a liver enzyme that rises with liver disease, bile duct problems and alcohol use. Here's what your GGT level means.

Written and clinically reviewed by Suman Konda, PharmD, Clinical Pharmacist · Based on peer-reviewed sources · Editorial policy · Not medical advice

Last reviewed and updated: 01 August 2026 · How we check our content

GGT reference ranges

Group	Normal Range
Men	10–71 U/L
Women	6–42 U/L
Mild elevation	2–3x upper limit
Significant elevation	>3x upper limit

What does high GGT mean?

Causes of raised GGT

GGT is the most sensitive liver enzyme for alcohol intake, even moderate regular drinking raises GGT. Other causes include non-alcoholic fatty liver disease (NAFLD), bile duct obstruction, liver inflammation (hepatitis), certain medications (phenytoin, carbamazepine, statins), and thyroid disease. GGT alone is not diagnostic. It is always interpreted alongside ALT, AST and ALP to identify the pattern of liver disease.

GGT and alcohol

GGT is widely used as a marker of alcohol use. It rises after as little as 3–4 drinks per day and normalises within 2–6 weeks of stopping alcohol. A raised GGT with normal ALT and AST in the context of alcohol use is a common finding. If GGT is raised alongside ALT/AST, liver cell damage is more likely.

GGT with other liver tests

Pattern	Likely cause
GGT raised, ALT/AST normal	Alcohol use, medication effect, fatty liver
GGT + ALT/AST raised	Hepatitis, significant liver disease
GGT + ALP raised	Bile duct obstruction, cholestasis
All liver tests raised	Significant liver disease: needs full workup

Questions to ask your doctor

Is my GGT elevation from alcohol or another cause?
Do I need an ultrasound of my liver?
Should I reduce alcohol intake and recheck?

Frequently Asked Questions

What does a raised GGT indicate?

GGT rises with bile duct problems, liver disease, and alcohol use. It's especially useful for confirming whether a raised ALP comes from the liver rather than bone.

Does alcohol affect GGT?

Yes. GGT is sensitive to alcohol and is often used to help assess alcohol-related liver effects. Levels usually fall over several weeks after reducing or stopping drinking.

Can GGT be high with an otherwise normal liver?

Mildly raised GGT in isolation is common and often not serious, but it's usually interpreted alongside other liver tests and lifestyle factors before deciding if further investigation is needed.

References

The clinical information on this page is drawn from peer-reviewed sources indexed by the US National Library of Medicine. Links go to the source so you can read it yourself.

Liver Function Tests. In: StatPearls. Treasure Island (FL): StatPearls Publishing. NCBI Bookshelf NBK482489