GGT
| Abbrev Code: | GGT | ||
| Order Code: | LAB85 | Order Name: | GGT |
| Synonyms: | Gamma Glutamyltransferase; Gamma Glutamyl Transpeptidase (GGTP) | ||
| Methodology: | Roche: Enzymatic colorimetric assay
Vista: Bichomatic rate |
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| CPT Codes: | 82977 x1 | ||
| Turnaround Time: | Performed and reported 24 hours/day. | ||
| Associated Links: | |||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 2.5 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Collection Instructions: | Chemistry Tests Containers Chart |
| Causes for Rejection: | Hemolysis |
Processing and Shipping
| Specimen Processing: | Centrifuge and aliquot within 2 hours of collection 1.25 mL, 0.2 mL minimum. Store in refrigerator. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | Roche: 7 days refrigerated; 1 year frozen.
Vista: 7 days at room temperature or refrigerated; 6 months frozen |
| Test Performed at or Referral Lab | Chemistry (Clinics, CSC Maple Grove, Roche-CSC Mpls, Roche-UMMC East, Roche-UMMC West) |
Interpretive
| Reference Range: |
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| Use: | ϒ-glutamyltransferase is used in the diagnosis and monitoring of hepatobiliary diseases. Enzymatic activity of GGT is often the only parameter with increased values when testing for such diseases and is one of the most sensitive indicators known. ϒ-glutamyltransferase is also a sensitive screening test for occult alcoholism. Elevated GGT activities are found in the serum of patients requiring longterm medication with phenobarbital and phenytoin. |
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