1. Because intrinsic factor is typically used as the binding protein in serum vitamin B12 assays, anti-intrinsic factor antibodies (which are common in pernicious anemia) can lead to elevated vitamin B12 measurement values. The Elecsys Vitamin B12 II assay is designed to avoid interference due to anti-intrinsic factor antibodies.2. For diagnostic purposes, the results should always be assessed in conjunction with the patient’s medical history, clinical examination and other findings.3. Note: The presence of immunoglobulin-vitamin B12 complexes may causeunexpectedly high values of vitamin B12.14,1