Preferred reflex test for the evaluation of vitamin B12 deficiency in individuals with macrocytic or unexplained anemia, or unexplained neurologic disease.
Quantitative Chemiluminescent Immunoassay/Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry
Plain red or serum separator tube. Also acceptable: Green (sodium or lithium heparin).
Protect from light during collection, storage and shipment. Centrifuge and remove serum from cells within 2 hours of collection. Transfer 2 mL serum or plasma to an ARUP Standard Transport Tube and refrigerate or freeze immediately. (Min: 1.5 mL)
EDTA plasma. Room temperature specimens. Grossly hemolyzed or lipemic specimens.
After separation from cells: Ambient: Unacceptable; Refrigerated: 48 hours; Frozen: 1 month
|Yes (0070150)||Vitamin B12||Effective December 2, 2013
|No||Methylmalonic Acid, Serum (Vitamin B12 Deficiency)||0.00-0.40 µmol/L|
If Vitamin B12 is less than 300 pg/mL, then Methylmalonic Acid, Serum (Vitamin B12 Status) will be added. Additional charges apply.
82607; if reflexed, add 83921
|Component Test Code*||Component Chart Name||LOINC|
|0055663||Vitamin B12 Status|
|0055664||Methylmalonic Acid, Serum|
- B12 (Cobalamin)
- B12 and MMA reflex
- B12 Assay
- B12 MMA
- B12, Serum
- Vit B12 and MMA