Test library
Gamma Glutamyl Transferase Test
A GGT test measures gamma glutamyl transferase, an enzyme found mainly in the liver and bile ducts. It helps evaluate liver and bile duct problems and clarify the cause of other abnormal liver enzyme results.
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Order GGT Test- Typical turnaround
- 1-3 business days
- Starting price
- From $25
- Results
- Confidential, online
Quick answer
The GGT test measures the level of gamma glutamyl transferase, an enzyme concentrated in the liver and bile ducts. It is often ordered alongside other liver tests to help identify whether the liver or bile ducts are involved in an abnormal result. Because GGT can rise for several reasons, it is interpreted with the full set of liver markers and the clinical picture.
What this test measures
Gamma glutamyl transferase is an enzyme involved in moving molecules across cell membranes, and it is found in the highest amounts in the liver and bile ducts. When those tissues are irritated or damaged, GGT can leak into the bloodstream and raise the measured level. It is one of several enzymes clinicians use to assess liver health.
A common use of GGT is to clarify an elevated alkaline phosphatase, another liver-related enzyme that also comes from bone. Because GGT responds mainly to liver and bile duct changes, a raised alkaline phosphatase paired with a normal GGT can point away from the liver, while both being elevated points toward it.
The test requires a blood sample and is frequently bundled with ALT, AST, bilirubin, and other markers. A high GGT does not identify a specific cause by itself, since alcohol use, medications, and various liver and bile duct conditions can all raise it. Clinicians interpret it alongside the other results.
- Gamma glutamyl transferase (GGT)
- Alkaline phosphatase (ALP)
- Alanine aminotransferase (ALT)
- Aspartate aminotransferase (AST)
- Total bilirubin
- Direct bilirubin
- Albumin
- Total protein
Why people order this test
- Evaluate a suspected liver or bile duct problem
- Clarify the source of an elevated alkaline phosphatase
- Monitor liver enzymes when a condition is known
- Investigate symptoms such as jaundice or abdominal discomfort
- Assess liver-related effects of certain medications or alcohol use
- Follow up on abnormal results from a routine metabolic panel
How to prepare
Fasting may be requested when GGT is ordered with other tests, and some laboratories prefer a short fast. Follow the instructions provided with the order, and tell the phlebotomist about any medications you take.
Understanding your results
Results are usually available within one to three business days. A high GGT can point to liver or bile duct involvement but does not identify a specific cause on its own. A qualified healthcare provider interprets the value alongside other liver tests and clinical findings.
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Frequently Asked Questions
What does GGT measure?
It measures the level of gamma glutamyl transferase, an enzyme concentrated in the liver and bile ducts. Higher levels can indicate that these tissues are under stress.
Why is GGT ordered with alkaline phosphatase?
The combination helps clinicians tell whether a raised alkaline phosphatase comes from the liver or from bone, since GGT rises mainly with liver and bile duct changes.
Does an elevated GGT always mean liver disease?
No. Levels can also rise with alcohol use, certain medications, and other conditions. The result is interpreted with the full clinical picture.
Do I need to fast?
Fasting may be requested depending on which tests are bundled with the order. Follow the laboratory's instructions.
How long do results take?
Most GGT results are reported within one to three business days.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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