GGT
GGT (gamma-glutamyl transferase) is an enzyme found mainly in the liver. It is one of the most sensitive markers for bile duct problems and alcohol-related liver damage.
Category: Liver Function
Also known as: ggt, gamma-glutamyl transferase, gamma gt, gamma-gt, ggtp, gamma glutamyl transpeptidase, Gamma-GTP, gama glutamil transferaza
Reference range: 8–61 U/L (Source: ABIM)
Standard unit: U/L
High values may indicate
High GGT may indicate bile duct obstruction, liver disease, alcohol abuse, pancreatitis, or use of certain medications such as anticonvulsants.
Low values may indicate
Low GGT is generally not a clinical concern and is usually considered normal.
Frequently asked questions
- What is a normal GGT level?
- A typical reference range for GGT is 8–61 U/L (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is GGT measured in?
- GGT is most commonly reported in U/L. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do GGT reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track GGT over time?
- Yes. Upload results from any lab and BloodId charts your GGT over time against its reference range, so you can see whether the trend is rising, falling, or stable.