Intrinsic Factor Blocking Antibody, Serum
Discontinue B12 shots and/or supplements for 1 week prior to testing.
7-10 Business Days
Intrinsic factor blocking antibody, which prevents the binding of vitamin B12 to the intrinsic factor molecule, is present in >50% of all patients with pernicious anemia and only rarely encountered in other conditions.
Pernicious anemia is one of the major causes of vitamin B12 deficiency.
Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.