Lab test

GGT Test - Gamma Glutamyl Transferase Test

A GGT test measures gamma-glutamyl transferase, an enzyme found mainly in the liver and bile ducts.

Typical price

From $25

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A GGT test measures gamma-glutamyl transferase, an enzyme found mainly in the liver and bile ducts. Elevated levels can accompany liver or bile duct irritation and are often interpreted alongside other liver enzymes. Clinicians order it to evaluate liver disease or damage, investigate abnormal liver tests, or help assess whether an elevated alkaline phosphatase comes from the liver.

• Gamma-glutamyl transferase (GGT) A liver and bile duct enzyme whose level can rise with liver or biliary irritation.

• People with abnormal liver enzyme results.
• Individuals with symptoms such as jaundice or abdominal discomfort.
• Those with a history of alcohol use or liver concerns.
• People taking medications that can affect the liver.
• Anyone being evaluated for bile duct problems.

• Fasting may be requested for some liver panels; follow the provider's instructions.
• Avoid alcohol for at least 24 hours before the test.
• Avoid strenuous exercise before the draw.
• Tell the provider about all medications and supplements.
• A standard blood draw is used for the sample.

An elevated GGT can be associated with liver or bile duct irritation and sometimes with alcohol use or certain medications. Because GGT can rise for reasons beyond the liver, it is usually interpreted with other liver enzymes such as ALP, ALT, and AST. A normal GGT can help clarify a mildly elevated alkaline phosphatase. Discuss your result with a healthcare provider.

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