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Background:  Plasma vitamin B12 [cobalamin (Cbl)] concentrations are usually measured as a screening marker for vitamin B12 deficiency. Siemens Healthcare Diagnostics has introduced Cbl assays for various platforms, i.e., the immulite (IML) 2000 and 2500. In our laboratories, regular validation studies for the IML 2500 were conducted and showed acceptable quality specifications. After the introduction of the IML 2500 Cbl assay, clinicians in the department of internal medicine reported an increased frequency of patients with Cbl-concentrations less than 148 pmol/L.

Introduction of a new cobalamin (vitamin B12) assay: lessons from a flawed validation study