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Collection Instructions

Unity Point Health - Cedar Rapids

Website:

Mayo Medical Laboratories

Mayo Clinic Laboratories

Test Code GGT Gamma GT, LAB85

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements

Container/Tube:

Preferred: Green-top (lithium heparin) tube

Acceptable: Gold-top serum gel tube, plain red-top tube, or EDTA plasma
Specimen Volume: A minimum volume of 2.3 uL plus a dead volume

Stability: Separated specimens should be analyzed immediately or kept at 2 – 25°C

               and analyzed within 7 days. For longer storage, samples may be frozen

               at -20°C for up to 1 year.

 
 

Reference Values

Males: 8-61 U/L

Females: 5-36 U/L

Day(s) Test Set Up

Monday through Sunday

Useful For

Gamma-glutamyltransferase measurement is principally used to diagnose and monitor hepatobiliary disease.  It is a sensitive enzymatic indicator of liver disease with normal values rarely found in the presence of hepatic disease.  GGT is also used as a sensitive screening test for occult alcoholism. 

Methodology

Enzymatic colorimetric assay

Test Classification and CPT Coding

82977

Report Available

STAT within 1 hour of receipt

Routine within 2 hours of receipt