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Test ID IFBA Intrinsic Factor Blocking Antibody, Serum

Useful For

Confirming the diagnosis of pernicious anemia

Special Instructions

Method Name

Immunoenzymatic Assay

Reporting Name

Intrinsic Factor Blocking Ab, S

Specimen Type


Specimen Required

Patient Preparation: For patients receiving vitamin B12 injections wait a minimum of 2 weeks after last injection before obtaining specimen.


Preferred: Serum gel

Acceptable: Red top

Specimen Volume: 1 mL

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 14 days
  Frozen  14 days

Reference Values


Day(s) and Time(s) Performed

Monday through Friday; 6 a.m.-12 a.m.

Saturday; 6 a.m.-6 p.m.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
IFBA Intrinsic Factor Blocking Ab, S 31444-3


Result ID Test Result Name Result LOINC Value
IFBLA Intrinsic Factor Blocking Ab, S 31444-3
CMT31 Comment 48767-8

Test Classification

This test has been cleared, approved or is exempt by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

Testing Algorithm

See Vitamin B12 Deficiency Evaluation in Special Instructions.

NY State Approved