Gamma Glutamyl Transferase (GGT)
Clinical Biochemistry
Sample and container requirements
Serum Lithium Heparin Plasma (paediatrics only)
Minimum volume required
80 µL serum/plasma
Special requirements
None
Patient preparation
Drugs such as phenytoin and barbiturates may cause high GGT levels due to enzyme induction.
Sample viability
Turnaround time
This assay is run throughout the day and night. The in-lab turnaround time is normally less than 24 hours.
Reference range
Females: <38 IU/L Males: <55 IU/L (Source: Abbott Diagnostics)
Clinical guidance
Gamma Glutamyl Transferase (GGT) is a sensitive indicator of hepatobiliary disease and is often used to determine the origin of elevated serum alkaline phosphatase (ALP) activity. Please refer to LabTestsOnlineUK to learn more about GGT. https://labtestsonline.org.uk/tests/gamma-glutamyl-transferase-ggt-test
Notes
Images to go here
This information was last updated on 19 August 2026