Test Overview
Test Methodology

Radiobinding Assay

Test Usage

Evaluation of conditions affecting vitamin B12 by altering the normal amounts of vitamin B12 binding protein, e.g., pregnancy.

Reference Range *

650 - 1340 pg/mL

Test Limitations

This test should not be ordered on patients who have recently received radioisotopes, therapeutically or diagnostically.

Test Details
Days Set Up
Varies; test performed twice per week
Analytic Time

2 days

Soft Order Code
ZW131
MiChart Code
Misc Quest Diagnostics-Nichols (Sendout)
Synonyms
  • Transcobalamin Vit B12 Carrier Protein
  • Transcobalamin Vit B12 Carrier Protein
  • UBBC
  • B12 Combining Capacity
  • B12 Combining Capacity
Laboratory
Sendout
Reference Laboratory
Mayo Wild 131 (ZW131) (Quest 928X)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect blood in a red top tube from a fasting patient. Centrifuge, aliquot serum into plastic vial and freeze. Recently administered radioisotopes will interfere with this assay.

Special Handling

Fasting specimen.

Alternate Specimen
SST acceptable (Red top tube preferred). [11/07]
Red Top Tube
Normal Volume
1 ml serum
Minimum Volume
0.2 ml serum
Additional Information

Test sent to Mayo Medical Laboratories; performed by Quest Diagnostics.

Billing
CPT Code
82608
LOINC
2171-7
NY State Approved
No