ARUP's Laboratory Test Directory

Vitamin B12 with Reflex to Methylmalonic Acid, Serum (Vitamin B12 Deficiency) : 0055662

Mnemonic: B12 MMA

Methodology: Quantitative Chemiluminescent Immunoassay/Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry
Performed: Sun-Sat
Reported: Next day for Vitamin B12; 4-6 days if MMA is performed
Specimen Required: Collect: Plain red or serum separator tube.

Specimen Preparation: Protect from light during collection, storage and shipment. Centrifuge and remove serum from cells within 2 hours of collection. Transfer 2 mL serum to an ARUP Standard Transport Tube and refrigerate or freeze immediately. (Min: 1.5 mL)

Storage/Transport Temperature: Frozen.

Unacceptable Conditions: Plasma. Room temperature specimens. Grossly hemolyzed or lipemic specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: Unacceptable; Refrigerated: 48 hours; Frozen: 1 month
Reference Interval:
 
Test Number Components Reference Interval
0070150Vitamin B12 210-911 pg/mL
 Methylmalonic Acid, Serum (Vitamin B12 Deficiency)
0.00-0.40 µmol/L

Note: If Vitamin B12 is 300 pg/mL, then Methylmalonic Acid, Serum (Vitamin B12 Deficiency) will be added. Additional charges apply.
CPT Code(s): 82607 Vitamin B12; if reflexed, add 83921 MMA
Cross References: B12 (Cobalamin) (Vitamin B12 with Reflex to Methylmalonic Acid, Serum (Vitamin B12 Deficiency))
 
 

 

 

 
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