Home
HelpTest Code LAB85 Gamma Glutamyltransferase
Clinical System Name
Gamma Glutamyltransferase
Synonyms
LAB85
GGT
GGTP (GGT)
SGGT
Sample Requirements
Specimen: Whole Blood
Container(s): Lt. Green/Mint Top Lithium Heparin, Lt. Green/Lithium Heparin Microtainer, Gold SST, Gold Microtainer, Dark Green/Sodium Heparin, Red
Preferred Vol: 1.0 mL
Minimum Vol: 0.5 mL
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
Storage location: Core 5 Chemistry Refrigerator
Off-site collection: Avoid hemolysis. Specimen should be centrifuged within 2 hours of collection. Spin blood and transfer serum or plasma to plastic tube and refrigerate or freeze.
Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum or Plasma | RT |
≤ 7 d |
| Serum or Plasma | 2-8 C |
≤ 7 d |
| Serum or Plasma | -20 C or -70 C |
≤ 60 d |
Availability
| STAT | Performed | TAT |
|---|---|---|
| Y | 24/7 | 1 h |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Core Chemistry
Phone Number: 206-987-2617 (Client Services)
CPT Codes
82977
Methodology
Method: Multiple Point Rate by Vitros 4600
Analytical Volume: 0.02 mL + 0.03 mL dead space
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 | ≤ 55 |
Description
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.