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γ-Glutamyl Transferase (GGT) CPT: 82977

Synonyms

Gamma-Glutamyl Transferase

Glutamyl Transpeptidase

Expected Turnaround Time

Within 1 day

Specimen Requirements

Specimen

Serum

Volume

1 mL

Minimum Volume

0.5 mL

Container

Red-top tube, gel-barrier tube, green-top (heparin) tube, or lavender-top (EDTA) tube

Collection

Separate serum or plasma from cells within 45 minutes of collection.

Storage Instructions

Room temperature

Stability Requirements

Temperature Period
Room Temperature 14 days
Refrigerated 14 days
Frozen 14 days
Freeze/thaw/ cycles Stable x 3

Patient Information

To evaluate for a possible liver disease or bile duct disease or to differentiate between liver and bone disease as a cause of elevated alkaline phosphatase (ALP); sometimes to screen for or monitor alcohol abuse.

When you have symptoms of a liver or bile duct disorder or as follow up when you have an increased ALP level.

A blood sample drawn from a vein in your arm.

GGT levels fall after meals; you may be instructed to fast (nothing to eat or drink except water) for at least 8 hours prior to the test. You may also be asked to stop drinking alcohol or taking certain prescription medications.