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GGT (Gamma-Glutamyl Transferase)

Gamma-GT (GGT): Normal Values and What a High Level Means

Q: Is GGT only related to alcohol use?

No, although GGT is highly sensitive to alcohol, it can also be elevated due to bile duct obstruction, liver disease, certain medications, diabetes, and heart failure. Your healthcare provider will interpret GGT alongside other markers.

Q: How quickly does GGT respond to changes in alcohol consumption?

GGT levels can begin to decrease within a few weeks of reducing or stopping alcohol intake. However, the timeline varies depending on the extent of liver involvement. Sustained abstinence typically leads to significant improvements.

Q: What is the difference between GGT and other liver enzymes?

GGT is particularly sensitive to bile duct dysfunction and alcohol use, while ALT is more specific to liver cell damage. AST is found in multiple tissues. They are often tested together to build a comprehensive picture of liver health.

GGT is one of the most sensitive liver enzymes available for health screening. Regular monitoring helps detect bile duct and liver issues early, supporting proactive and informed health management.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Age years

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Your reference range

u/l

38 55 u/l

Reference ranges by group, in u/l
Sex	Age	Reference range (u/l)	Relative scale
Male	· 19 years and older	< 55 u/l	55
Female	· 19 years and older	< 38 u/l	38

38 55 u/l

Dit is de bovengrens die het laboratorium op uw eigen uitslag vermeldt.

Source: Star-shl Reference population: Nederlandse volwassenen (referentiewaarden van de uitvoerende laboratoria)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

GGT (Gamma-Glutamyl Transferase): what this test measures

GGT is an enzyme found primarily in the liver and bile ducts, though it is also present in the kidneys, pancreas, and intestines. It plays a role in the transport of amino acids and peptides across cell membranes.

This test measures the concentration of GGT in your blood. Because GGT is highly sensitive to bile duct dysfunction and alcohol use, it is often used alongside other liver enzymes such as ALT, AST, and alkaline phosphatase to help pinpoint the source of liver or biliary abnormalities.

GGT (Gamma-Glutamyl Transferase): why this value matters

GGT is considered the most sensitive enzymatic indicator of bile duct problems. Elevated levels may suggest bile duct obstruction, liver inflammation, or chronic alcohol use, often before other liver enzymes become abnormal.

Because GGT responds quickly to alcohol intake, it is frequently used to monitor alcohol-related liver damage. Tracking GGT over time can provide valuable insight into the effectiveness of lifestyle changes and treatment.

GGT (Gamma-Glutamyl Transferase): when is testing worthwhile?

Testing may be recommended when liver or bile duct disease is suspected, or to evaluate unexplained elevations in alkaline phosphatase. GGT is also commonly ordered to assess the impact of alcohol use on the liver.

Regular monitoring may be appropriate for individuals taking medications known to affect the liver, those with a history of alcohol misuse, or anyone undergoing treatment for liver or biliary conditions.

GGT (Gamma-Glutamyl Transferase): symptoms of a high or low value

Low Levels

Low GGT levels are generally not clinically significant and typically indicate normal liver and bile duct function.

High Levels

Fatigue and general malaise
Jaundice (yellowing of skin or eyes)
Abdominal pain, particularly in the upper right area
Nausea or loss of appetite
Dark urine or pale stools

GGT (Gamma-Glutamyl Transferase): what to do about an abnormal value

Male

If Low

Normal GGT indicates healthy liver function. Maintain moderate alcohol consumption.

If High

Elevated GGT may indicate alcohol use, bile duct problems, or liver disease. Consider reducing alcohol intake and consulting your healthcare provider.

Female

If Low

Normal GGT indicates healthy liver function. Maintain healthy lifestyle habits.

If High

Elevated GGT may indicate bile duct problems or liver disease. Consider evaluation with your healthcare provider.

GGT (Gamma-Glutamyl Transferase): lifestyle and this value

Reducing or eliminating alcohol consumption is the most effective way to lower elevated GGT levels. Even moderate alcohol intake can raise GGT, so periods of abstinence may be beneficial for liver recovery.

Maintain a balanced diet rich in fruits, vegetables, and whole grains. Discuss all medications and supplements with your healthcare provider, as certain drugs including over-the-counter pain relievers can elevate GGT. Regular physical activity and maintaining a healthy weight also support liver health.

GGT (Gamma-Glutamyl Transferase): frequently asked questions

Is GGT only related to alcohol use?

No, although GGT is highly sensitive to alcohol, it can also be elevated due to bile duct obstruction, liver disease, certain medications, diabetes, and heart failure. Your healthcare provider will interpret GGT alongside other markers.

How quickly does GGT respond to changes in alcohol consumption?

GGT levels can begin to decrease within a few weeks of reducing or stopping alcohol intake. However, the timeline varies depending on the extent of liver involvement. Sustained abstinence typically leads to significant improvements.

What is the difference between GGT and other liver enzymes?

GGT is particularly sensitive to bile duct dysfunction and alcohol use, while ALT is more specific to liver cell damage. AST is found in multiple tissues. They are often tested together to build a comprehensive picture of liver health.

Test Products

This marker is included in the following test panels.

InsideTracker

An InsideTracker blood test with 35 biomarkers: heart, hormones, metabolism, inflammation, recovery and iron status. Measured in the Netherlands.

SHBG (Sex Hormone Binding Globulin) TSH (Thyroid Stimulating Hormone) ALT (Alanine Aminotransferase) LDL Cholesterol GGT (Gamma-Glutamyl Transferase) Cortisol DHEA-S Estradiol (E2) Free Testosterone Total Testosterone Folate (Folic Acid) Vitamin B12 Calcium Ferritin Iron (Serum) Magnesium Potassium Progesterone Sodium Transferrin CRP (C-Reactive Protein) Glucose (Fasting) HbA1c (Glycated Hemoglobin) ApoB (Apolipoprotein B) HDL Cholesterol Total Cholesterol Albumin AST (Aspartate Aminotransferase) Vitamin D (25-OH) Insulin (Fasting) Leukocyte Differential Creatine Kinase (CK) Transferrin Saturation Triglycerides Basic Blood Count

€399,-

Whoop

Whoop Metabolic Health

A 51-biomarker metabolic panel inspired by the WHOOP Metabolic Health Panel — blood sugar regulation, insulin, thyroid, liver and the mineral cofactors behind your metabolism.

Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) Leptin Zinc Selenium Iodine Copper Free T3 (Triiodothyronine) Free T4 (Thyroxine) GGT (Gamma-Glutamyl Transferase)

€799,-

InsideTracker

InsideTracker Recovery

A 10-biomarker recovery panel inspired by InsideTracker's Recovery category — muscle enzymes, liver values, electrolytes, magnesium and vitamin D behind your recovery score.

Magnesium CRP (C-Reactive Protein) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) GGT (Gamma-Glutamyl Transferase) Albumin Creatine Kinase (CK) Sodium Potassium Vitamin D (25-OH)

€139,-