Gamma-Glutamyl Transpeptidase

Special Considerations

Drugs that can increase GGT levels include alcohol, phenytoin, and phenobarbital.

Drugs that can decrease GGT levels include clofibrate and oral contraceptives (birth control pills).

Veins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

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