Intrinsic Factor Blocking Antibody

Test Code

IFAB

Quest Code

568

Alias/See Also

568

CPT Codes
86340

Preferred Specimen

1 mL serum

Minimum Volume

0.3 mL

Instructions

Samples should not be collected from a patient who has received Vitamin B12 injection therapy within the last week

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days

Methodology
Immunoassay (IA)

Setup Schedule

Set up: Tues-Sat; Report Available: 2-3 days

Reference Range

Negative

Clinical Significance

Intrinsic Factor, produced by cells lining the stomach, binds Vitamin B12 (cyanocobalamin) to facilitate absorption of the vitamin. Blocking antibody impedes the action of Intrinsic Factor as observed in approximately half of the patients who develop pernicious anemia.

Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130

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.