Click here for more information about laboratory operations and procedures
If you have additional questions regarding this test, please call: 415-353-1667
|Available Stat?||Yes (always run STAT)|
|Performed by||Parnassus & Mission Bay Chemistry|
|In House Availability||Test available 24 hours per day 7 days per week|
|Method||Spectrophotometric, kinetic (glutamate dehydrogenase)|
|Collection Instructions||Pre-chill tube. Deliver to lab immediately on ice.
NOTE: Ammonia cannot be 'added-on' to a previously tested sample
|Container type||Light Green top (on ice)|
|Amount to Collect||2 mL blood|
|Sample type||Heparinized plasma|
|Preferred volume||1 mL plasma|
|Min. Volume||0.7 mL plasma|
|UCSF Rejection Criteria||Not delivered on ice|
|Processing notes||Centrifuge tube with stopper in place and run test IMMEDIATELY.
If the test is ordered routine or at Mt. Zion, collect the specimen and centrifuge within 20 minutes. Aliquot and freeze the plasma at -20C immediately and send to Moffitt/Long on next scheduled delivery run.
Note: Reference ranges determined by validating the assay manufacturer's reference range in 24 adult laboratory staff and by adapting the newborn reference range from method number 2 in Soldin et al. Pediatric Reference Intervals, 6th edition, 2007
|Stability||Specimen stability: 20 minutes.|
|Turn around times||1 hour|
|Additional information||NOTE: Ammonia cannot be 'added-on' to a previously tested sample
False positive elevations of ammonia can be caused by many factors including use of capillary samples or by delay between sampling and centrifugation (Clinical Biochemistry 40:531-535, 2007).
Newborn reference range adopted from Maranda et al., Clinical Biochemistry 40:531-535, 2007.
|Last Updated||5/26/2015 1:07:54 PM|
|Lab Procedure Link||Click here for Procedure|