The text of the letter entitled "High Measured Cobalamin (VitaminB12) Concentration Attributable to an Analytical Problem inTesting Serum from a Patient with Pernicious Anemia" by L.T.Vlasveld, J.W. vant Wout, P. Meeuwissen, and A. Castel(Clin Chem 2006;52:1578) contains two errors. The referenceinterval for holoTC should read 55170 pmol/L, not 55170L. In addition, the sentence reading "After magnetic separationof bound and unbound Cbl and a washing step, the chemiluminescenceactivator is linked to anti-HIF antibody bound to the immobilizedCbl-coated beads in the Immulite 2000 assay and to the acridiniumester-labeled Cbl in the ADVIA assay." should read "Separationof bound and unbound Cbl is achieved by a magnetic separator.After washing, the chemiluminescence activator is linked toanti-HIF antibody bound to the immobilized Cbl-coated beadsin the Immulite 2000 assay and to the acridinium ester-labeledCbl in the ADVIA assay."