ARUP's Laboratory Test Directory

Vitamin B12 : 0070150

Mnemonic: B12

Methodology: Chemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect:  One 4 mL serum separator tube.

Storage/Transport Temperature:  1 mL serum, frozen. (Min: 0.5 mL)  Protect from light.  Submit specimen in an ARUP Amber Transport Tube. 

Remarks:  Allow serum to clot completely at room temperature before centrifuging.  Protect from light during collection, storage, and shipment.

Stability (collection to initiation of testing):  After separation from cells: Ambient: 8 hours; Refrigerated: 2 days; Frozen: 3 months
Reference Interval:
210-911 pg/mL
Note: Also refer to Methylmalonic Acid (MMA), Serum Quantitative (0099431).  Some references suggest that elevated methylmalonic acid is an early and sensitive indicator of vitamin B12 (cobalamin) deficiency.
CPT Code(s): 82607
Cross References: B12 Vitamin, Cobalamin
 
 

 

 

 
All ARUP Sites:        www.aruplab.com     ·     www.arupconsult.com     ·     www.arup.utah.edu     ·     www.childx.org     ·     www.utahblood.org