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Test Code GGT Gamma GT, LAB85


Rate Reaction

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Green-top (lithium heparin) tube

Acceptable: Gold-top serum gel tube or plain red-top tube
Specimen Volume: 0.1 mL of plasma or serum

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 6 months.


Reference Values

Males: 15-85 U/L

Females: 5-55 U/L

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


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.