Test Code VB12B Vitamin B12 Binding Capacity, Unsaturated (Transcobalamin)
Specimen Required
1 mL serum
Specimen Minimum Volume
0.2 mL
Specimen Stability
Room temperature: 4 days Refrigerated: 14 days Frozen: 30 days
Method Name
Radiobinding Assay
Collection Container / Tube
Preferred: Gold SST Tube
Other Acceptable Container: None
Transport Container
Plastic screw-cap vial
Transport / Storage Conditions
Refrigerated (cold packs)
Reference Values
Adults 650-1340 pg/mL
Day(s) Performed
Set up: Tues, Thurs, Sat afternoon; Report available: 1 day
CPT Codes
82608
Clinical Reference
Vitamin B12 Binding Capacity, Unsaturated (Transcobalamin), binds and transports vitamin B12 in the circulation. Increased concentrations are associated with patients with myeloproliferative disorders. Decreased concentrations are seen in individuals with megaloblastic anemia or Transcobalamin deficiency.