Vitamin B12, Serum

Test Code

CPT Codes

Preferred Specimen
1 mL serum

Minimum Volume
0.3 mL

Minimize exposure to light.

Transport Container
Plastic screw-cap vial

Transport Temperature
Refrigerated (cold packs)

Specimen Stability
Room temperature: 7 days

Rrefrigerated: 7 days

Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Immunoassay (IA)

Reference Range
≤4 Years Not established
5-9 Years 250-1205 pg/mL
10-17 Years 260-935 pg/mL
>17 Years 200-1100 pg/mL

Clinical Significance
Vitamin B12 is decreased in pernicious anemia, total or partial gastrectomy, malabsorption and certain congenital and biochemical disorders.

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.