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Lab Manual for Moffitt-Long and Mount Zion

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Gamma-Glutamyl Transpeptidase

Item Value
Approval req'd? No
Available Stat? No
Test code GGT
Performed by Parnassus & Mt. Zion Chemistry
In House Availability Test available 24 hours per day 7 days per week
Method Kinetic enzymatic (glutamyl carboxynitroanilide)
Container type Gold top or Light Green top
Amount to Collect 1 mL blood Click here for Microdetermination info
Sample type Serum or plasma
Preferred volume 0.5 mL serum or plasma
Min. Volume 0.2 mL serum or plasma Click here for Microdetermination info
Units U/L
Normal range
Age Male Female
0 - 7 days 25-168 U/L 18-148 U/L
8 days - 30 days 23-174 U/L 16-140 U/L
1 month - 3 months 16-147 U/L 16-140 U/L
4 months - 6 months 5-93 U/L 13-123 U/L
7 months - 11 year 8-38 U/L 8-59 U/L
1 year - 4 years 2-15 U/L 2-15 U/L
5 years - 9 years 6-16 U/L 6-19 U/L
10 years - 17 years 7-26 U/L 8-23 U/L
≥ 18 years 10-69 U/L 7-37 U/L


1. Normal range for children 0 to <5 year adopted from Soldin, Steven J., "Pediatric Reference Ranges", 6th edition, AACC Press, 2007, method 4
2. Normal range for children 5 to less than 18 years old adopted from Beckman Coulter's
"Pediatric Reference Range Guidelines for Synchron Systems" Bulletin 9345
3. Normal range for adults was determined by testing 271 male and female healthy blood donors at UCSF.
Synonyms GGT
Stability Room temperature 8 hours, refrigerated 2 days, frozen at -20C 1 week
Turn around times 4 hours
Additional information Hemolysis may artIfactually lower the result.
CPT coding 82977
Medical Necessity? Yes. Click here for more information
LOINC code 2324-2
Last Updated 2/17/2012 9:57:27 AM
Entry Number 418
Lab Procedure Link Click here for Procedure

If you have additional questions regarding this test, please call: 415-353-1667

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