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GGT (Gamma-Glutamyl Transferase) Test

⚠️ Update approaching🔬 Evidence: ModerateInternal Medicine
Diğer adları: Gamma-glutamyl transferase, Gamma-GT, GGT test
⚠️

Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• An enzyme concentrated in the liver and bile ducts • Low specificity — may rise in many conditions • Particularly useful for confirming liver origin of elevated ALP • Sensitive to alcohol use

🧪 What Does This Test Measure?

The GGT test measures gamma-glutamyl transferase, a liver and bile duct enzyme that is particularly sensitive to alcohol use and cholestatic liver conditions.

📋 Why Is It Ordered?

Ordered to confirm liver origin of elevated ALP, evaluate alcohol-related liver damage, and assess metabolic syndrome-associated liver involvement.

🔧 Preparation

No special preparation is generally required. However, alcohol consumption may significantly elevate GGT and should be noted.

📊 Reference Ranges

Men: 8–61 U/L Women: 5–36 U/L ⚠️ Reference ranges vary by laboratory.

⬆️ High Values

Elevated GGT may be associated with alcohol use, medications, metabolic syndrome, obesity, liver disease, or bile duct obstruction.

⬇️ Low Values

Low GGT is generally not clinically concerning and is often considered a favorable finding.

⚙️ What Can Affect Results?

Alcohol consumption, medications, body weight, metabolic status, age, sex, and physical activity may affect GGT results.

🔬 Evidence Summary

Moderate evidence: 2 guidelines, 1 meta-analysis.

📚 Most Important Studies on This Topic

1

ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries

Guideline· American Journal of Gastroenterology · 2017 · PMID: 27995906

2

EASL Clinical Practice Guidelines on non-invasive tests for evaluation of liver disease severity and prognosis - 2021 update

Guideline· Journal of Hepatology · 2021 · PMID: 34166721

3

Gamma-glutamyltransferase and risk of cardiovascular mortality: A dose-response meta-analysis of prospective cohort studies

Meta-analysis· PLoS One · 2017 · PMID: 28231268

✅ Key Takeaways

💡

What you learned: GGT is sensitive but not specific. It is most useful for confirming liver origin of ALP elevation and assessing alcohol-related liver effects.

⛔

A GGT result alone cannot diagnose liver disease. It should be interpreted alongside other liver tests and clinical context.

🔬 Sources Used on This Page

3 sources · Most recent publication: 2021
📋
Guideline
Expert society and guideline recommendations
2
sources
📊
Systematic review / meta-analysis
Combined analysis of multiple studies
1
source
Overall assessment: Evidence level for this topic is strong. This page is supported by 2 guidelines, 1 systematic review/meta-analysis.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

📋 References

[PMID: 34166721] EASL Clinical Practice Guidelines on non-invasive tests for evaluation of liver disease severity and prognosis - 2021 update. Journal of Hepatology, 2021.
[PMID: 27995906] ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries. American Journal of Gastroenterology, 2017.
[PMID: 28231268] Gamma-glutamyltransferase and risk of cardiovascular mortality: A dose-response meta-analysis of prospective cohort studies. PLoS One, 2017.
Last reviewed: 4/1/2026
Next review: 4/1/2027

⚖️ Comparisons

GGT vs ALP→ALT/AST vs GGT→

🔗 Related Topics

🩺 Karaciğer hastalıkları🧪 ALT/AST (karaciğer enzimleri)🧪 Bilirubin🧪 ALP (alkalen fosfataz)
⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.