Item Value
Test name Gamma-Glutamyl Transpeptidase, Plasma / Serum
Available Stat? No
Turn around times 4 hours
In House Availability Test available 24 hours per day 7 days per week
Performed by Parnassus, Mission Bay & Mt. Zion Chemistry
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 - 1 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.
Container type Light green top preferred, Gold top acceptable
Amount to Collect 1 mL blood
Click here for Microdetermination info
Sample type Plasma or serum

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