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Vitamin B12 Binding Capacity

Additional Codes


Performing Laboratory

ARUP Laboratories

Specimen Type


Specimen Required

Draw blood in a plain, red-top tube(s). (Serum gel tube is acceptable.) Spin down and send 1 mL of serum refrigerated in a plastic vial.


Note: Patient should fast for 12 – 15 hours prior to collection. Vitamin B12 supplements should not be administered within 72 hours of drawing blood for this test.

Specimen Minimum Volume

0.1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 7 days
  Frozen  30 days
  Ambient  6 hours

Reference Values

800 – 2600 pg/mL


Interpretive Information: Vitamin B12 Binding Capacity

This assay measures the unsaturated binding capacity of serum for Vitamin B12.

Day(s) and Time(s) Performed

Monday, Thursday

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FVITB Vitamin B12 Binding Capacity 2171-7


Result ID Test Result Name Result LOINC Value
Z2657 Vitamin B12 Binding Capacity 2171-7

Analytic Time

1 to 5 days