Gamma Glutamyl Transferase (GGT) test is a blood test that measures the level of the enzyme GGT in the blood. GGT is an enzyme found in many organs, including the liver, pancreas, and bile ducts.

Pre-test preparation: There is no specific preparation required for a GGT test.

Testing method: A small sample of blood is taken from a vein in your arm and sent to a laboratory for analysis.

Common symptoms that may prompt your doctor to order a GGT test include: Jaundice (yellowing of the skin and eyes), abdominal pain, and dark urine.

Diagnosis: Elevated levels of GGT in the blood can indicate liver or bile duct damage or disease, such as liver cirrhosis, hepatitis, and cholecystitis. GGT is also used as a marker of alcohol consumption, as well as a marker of drug-induced liver injury.

Reference range: The reference range for GGT in the blood varies depending on laboratory, but typically ranges from 5-55 U/L for men and 5-35 U/L for women.

Normal values may vary depending on the laboratory that performs the test.

Medical disclaimer: The information provided is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition. It is important to follow the instructions given by your doctor or the laboratory performing the test. If you have symptoms that suggest liver or bile duct disease, or have been advised to have a GGT test, it is important to work closely with your doctor to understand the results and any further actions that may be necessary.