What is GGT?
GGT, also known as Gamma Glutamyl Transferase, tests are most often run in response to increased Alkaline Phosphatase (ALP). ALP is part of some routine liver tests. Elevated ALP can be caused by liver disease or bone disease, among other conditions, but elevated ALP with normal GGT is more indicative of bone disease than liver disease. If ALP levels are elevated, a second blood test including GGT levels is ordered to rule out or support a bone disease diagnosis. There are no definitive symptoms of elevated GGT, but there are symptoms of conditions that can cause elevated GGT such as swelling of the abdomen, vomiting, nausea, and loss of appetite. GGT testing is not effective for diagnosing liver disease.
Normal value range
- Negative Pregnancy Adult: 9 to 58 U/L or 0.15 to 0.97 µkat/L
- Pregnancy Trimester One: 2 to 23 U/L or 0.03 to 0.38 µkat/L
- Pregnancy Trimester Two: 4 to 22 U/L or 0.07 to 0.37 µkat/L
- Pregnancy Trimester Three: 3 to 26 U/L or 0.05 to 0.43 µkat/L