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Test Code GGT Gamma Glutamyltransferase

Clinical System Name

Gamma Glutamyltransferase




Serum GGT is a sensitive indicator of hepatobiliary disease and is useful in the diagnosis of obstructive jaundice, and in the detection of hepatotoxicity.  GGT is more responsive to biliary obstruction than AST, ALT, or ALKP. GGT is also increased in hepatoma, carcinoma of the pancreas, and carcinoma metastatic to the liver.

Sample Requirements

Specimen:  Whole Blood

Container(s): Gold SST, Dark Green/Sodium Heparin, Red, Gold Microtainer, Lt. Green/Li Heparin Microtainer

Preferred Vol:  1.0 mL

Minimum Vol:  0.5 mL serum or plasma


Note:  Method is affected by hemolysis. Method is not affected by lipemia.


Processing Instructions

Reject due to:  Hemolysis, age of specimen

Spin: Y

Aliquot: Y

Temp: 2-8oC

Storage location: Core 5 Chemistry Refrigerator


Off-site collection:  Avoid hemolysis. Spin blood, separate serum/plasma from cells. Refrigerate specimen.



Specimen Type Temperature Time
Serum or Plasma RT

7 D

Serum or Plasma 2-8oC

 7 D

Serum or Plasma -20oC or -70oC

60 D



STAT Performed TAT
Y 24/7 1 H


Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Chemistry

Phone Number: 206-987-2617

Reference Range


Age IU/L at 37° C
0 - 3 W 0 to 115
3 W- 3 M 0 to 135
>3 M, Male 15 - 85
>3 M, Female 5 - 55



Method:  Multiple Point Rate by Vitros 4600

Analytical Volume: 0.02 mL + 0.03 mL dead space

CPT Codes