Abbrev Code:GGT   
Order Code:LAB85Order Name:GGT
Synonyms:Gamma Glutamyltransferase; Gamma Glutamyl Transpeptidase (GGTP)
Methodology:Roche: Enzymatic colorimetric assay
Vista: Bichomatic rate
CPT Codes: 82977 x1
Turnaround Time:Performed and reported 24 hours/day.
Associated Links:

Roche Go Live Schedule

Collection Instructions

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:7 days at refrigerated temperature; 1 year frozen.
Test Performed at or Referral Lab Chemistry  (Clinics, CSC Maple Grove, Grand Itasca, Northland, Oxboro Clinic, Roche-CSC Mpls, Roche-UMMC East, Southdale, UMMC/UMMCH-West Bank)


Reference Range:
Site Age Female U/L Male U/L
Grand Itasca All 9-64 9-64
Vista 0-4 d 0-263 0-263
Vista 5d-2 mo 0-130 0-130
Vista 3-11 mo 0-65 0-65
Vista 1-11 y 0-30 0-30
Vista 12-19 y 0-30 0-44
Vista 20 Y & older 0-40 0-75
Roche 0-11 mo <178 <178
Roche 12 mo - 6 y <21 <21
Roche 7-12 y <24 <24
Roche 13-17 y <26 <43
Roche 18 y & older 5-36 8-61
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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