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Test Code BLOD0561 Gamma-Glutamyltransferase (GGTP), Plasma or Serum

Useful For

The diagnosis of obstructive jaundice, intrahepatic cholestasis, pancreatitis, and metastatic carcinoma of the liver. GGT is a biliary enzyme that parallels alkaline phosphatase in liver disease, but is not elevated in bone disease.


GCNA/Calibrated/37° C/Bichromatic Rate

Performing Laboratory

Bozeman Health Laboratory Services

Specimen Requirements

Specimen Type: Plasma or serum
Container/Tube: Light-green top (lithium heparin gel), red top, or gold top
Specimen Volume: 1 mL
Specimen Minimum Volume: 0.5 mL

Collection Instructions: Label specimen as plasma or serum.

Specimen Transport Temperature


Specimen Stability


Specimen Type Temperature Time
Plasma or Serum Ambient 7 days
  Refrigerated 7 days
  Frozen 6 months


Reference Values

Females: 0-55 U/L

Males: 0-85 U/L


Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding