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Vitamin B[12]
MessageAlso 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.
Test Code
2606
Alias/See Also
Methylcobalamin; B12 Vitamin; Cobalamin; Vit B12
Preferred Specimen
One 4 mL serum separator tube.
Minimum Volume
1 mL serum, frozen. (Min: 0.5 mL) Protect from light. Submit specimen in original tube.
Transport Temperature
1 mL serum, frozen. (Min: 0.5 mL) Protect from light. Submit specimen in original tube.
Specimen Stability
After separation from cells: Ambient: 8 hours; Refrigerated: 2 days; Frozen: 3 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed specimens.
Methodology
Chemiluminescent Immunoassay
Setup Schedule
Sun-Sat
Report Available
Within 24 hours
Limitations
Allow serum to clot completely at room temperature before centrifuging. Protect from light during collection, storage, and shipment.
