About GGT
Optimal liver function
Reference Values
Optimal Range
0 - 10 U/L
Elite Value
10 U/L
Health Implications
High
Elevated levels may indicate liver disease, alcohol abuse, or bile duct problems, as GGT is often used to assess liver function and damage.
Low
Low levels may be associated with a reduced risk of liver disease or reflect a healthy liver, though they are less commonly a cause for concern when compared to high levels.
Symptoms
High
May include fatigue, abdominal pain, nausea, vomiting, and jaundice.
Low
Can include fatigue, dizziness, and weakness, although often asymptomatic.
Lifestyle Factors
Specimen Type
Testing Methods
Also Known As
Scientific Sources
- 1. Lippi, G., & Plebani, M. (2020). Gamma-glutamyltransferase: From laboratory to clinical practice. Clinical Chemistry and Laboratory Medicine, 58(5), 684-697.
- 2. Whitfield, J. B. (2021). Gamma glutamyl transferase. Critical Reviews in Clinical Laboratory Sciences, 58(4), 257-282.
- 3. EASL Clinical Practice Guidelines Panel. (2018). EASL Clinical Practice Guidelines: Management of alcohol-related liver disease. Journal of Hepatology, 69(1), 154-181.
- 4. American Association for the Study of Liver Diseases. (2018). Diagnosis and management of nonalcoholic fatty liver disease: A practice guideline. Hepatology, 67(1), 328-357.
- National Institute on Alcohol Abuse and Alcoholism. (2020). Alcohol and the liver. Retrieved from