Intrinsic Factor Blocking Antibody

Test Code
INTRFA (568)

Quest Code
568

CPT Codes
86340

Preferred Specimen
1 mL serum

Patient Preparation
Samples should not be collected from a patient who has received vitamin B12 injection therapy within the past week

Minimum Volume
0.3 mL

Transport Temperature
Room temperature

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

Methodology
Immunoassay (IA)

Setup Schedule
Sun, Tue, Thu

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 92675



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.