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Order Code GGT Gamma-Glutamyltransferase (GGT), Plasma or Serum

Specimen Requirements

Specimen Type: Serum or Plasma

Collection Container/Tube:

Preferred: Green-top (lithium heparin) gel tube.

Acceptable: Plain, red-top tube or a serum SST tube

Specimen Volume: 2 mL

Pediatric (minimum) volume: 0.5 mL in a green top (lithium heparin) or plain red MICROTAINER

Transport Requirements


Specimen Type Temperature Time
Serum/plasma Ambient 8 hours
  Refrigerated (preferred) 5 days
  Frozen OK


Performing Laboratory

Ridgeview Medical Center Laboratory

Day(s) Test Set Up

Monday through Sunday


Bichromatic rate

Test Classification and CPT Coding


Reference Values

5-85 U/L

Specimen Minimum Volume

0.5 mL

Useful For

Diagnosing and monitoring hepatobiliary disease, it is currently the most sensitive indicator of liver disease