ARUP's Laboratory Test Directory
| 0070150: Vitamin B12 |
| Test Mnemonic: B12 | |
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#ExistMethodology>
Methodology: Chemiluminescent Immunoassay
*ExistMethodology> #ExistPerformed> Performed: Sun-Sat *ExistPerformed> #ExistReported> Reported: Within 24 hours *ExistReported> |
| Specimen Required: | |
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#ExistCollect>
Collect: One 4 mL SST.
*ExistCollect> #ExistTransport> Transport: 1 mL serum, frozen. (Min: 0.5 mL) Protect from light. Submit specimen in an ARUP Amber Transport Tube. *ExistTransport> #ExistPedCollectTransport> Pediatric Collection/Transport: 0.3 mL serum, frozen. *ExistPedCollectTransport> #ExistRemarks> Remarks: Allow serum to clot completely at room temperature before centrifuging. Protect from light during collection, storage, and shipment. *ExistRemarks> #ExistStability> Stability: After separation from cells: Ambient: 8 hours; Refrigerated: 2 days; Frozen: 3 months *ExistStability> |
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| Reference Interval: |
| #ExistRefRange> 210-911 pg/mL *ExistRefRange> |
| 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 |