Interpret Your Gamma-Glutamyl Transferase Results
Enter your GGT value below and get an instant, free AI interpretation — a plain-English explanation checked against WHO/IFCC reference ranges.
Medical Disclaimer
This AI-generated interpretation is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Results may vary based on individual health factors not captured here.
Always consult a qualified healthcare professional before making any health decisions. Read full disclaimer →
Gamma-Glutamyl Transferase Normal Ranges
GGT is an enzyme found primarily in the liver, pancreas, and kidneys.
| Age Group | Sex | Reference Range | Unit | Notes |
|---|---|---|---|---|
| Adults (18–64) | Male | 8 – 61 | U/L | — |
| Adults (18–64) | Female | 5 – 36 | U/L | — |
Also reported in: IU/L.
Why Doctors Order the Gamma-Glutamyl Transferase Test
GGT is the most sensitive liver enzyme — it is elevated before other markers in early liver disease. Its primary clinical value is as a complementary test: when ALP is elevated, an elevated GGT confirms a liver source.
How to Enter Your GGT Result
Gamma-Glutamyl Transferase can be reported in U/L or IU/L. Choose the unit printed next to your result on the lab report so it is compared with the matching reference range.
Reference ranges for GGT differ between men and women, so entering your sex gives a more accurate reading.
What a Low or High GGT Can Be Associated With
Below the reference range
- Not clinically significant
- Hypothyroidism (can slightly lower GGT)
Above the reference range
- Alcohol use (even without liver disease)
- Non-alcoholic fatty liver disease (NAFLD)
- Cholestatic liver disease (bile duct obstruction, primary biliary cholangitis)
- Medications: anticonvulsants (phenytoin, carbamazepine), warfarin, statins, antidepressants
- Chronic pancreatitis
These are common associations, not a diagnosis. A single result is read alongside your symptoms, history and other tests — discuss it with your doctor.
What Can Change Your GGT Result
Before you read too much into a result, consider whether any of these applied:
- Alcohol consumption (raises GGT even in moderate amounts)
- Numerous medications (phenytoin, carbamazepine, warfarin, statins)
- Obesity (independently raises GGT)
- Smoking (mild elevation)
Preparing for the test: Fasting is not strictly required but preferred. Avoid alcohol for at least 24 hours before testing to accurately assess baseline GGT.
Symptoms That Often Prompt GGT Testing
- Typically asymptomatic in isolation
- Symptoms of underlying liver disease if present (jaundice, fatigue)
Want the full clinical guide to Gamma-Glutamyl Transferase?
Reference ranges, causes, symptoms, preparation, and FAQs.