title: [Interferences by a monoclonal IgM in biochemical analyses: detection and recommendations].
abstract: We present a case of analytical interference on three parameters (lactate dehydrogenase, uric acid and alkalin phosphatase), caused by a monoclonal IgM, evidenced in a patient with Waldenström disease. Mechanism of interference was probably related to the formation of complexes between paraprotein and lithium heparin, which result in precipitation during clinical chemistry assays, inducing a bias in the results. Management recommendations in case of suspicion of interference in clinical chemistry analysis are detailed. Are discussed for the case report, clinical consequences, possible mechanisms and evolution of interference under treatment, according to the concentration of the monoclonal protein.
authors.affiliation: Laboratoire de biochimie, Hôpital Roger Salengro, Lille.
authors.forename: A
authors.initials: A
authors.lastname: Barbier
authors.forename: I
authors.initials: I
authors.lastname: Vuillaume
authors.forename: A
authors.initials: A
authors.lastname: Baras
authors.forename: V
authors.initials: V
authors.lastname: Coiteux
authors.forename: P
authors.initials: P
authors.lastname: Maboudou
authors.forename: J
authors.initials: J
authors.lastname: Rousseaux
mesh_terms: D000368:Aged; D000469:Alkaline Phosphatase / Q000097:blood; D000911:Antibodies, Monoclonal / Q000097:blood*; D003951:Diagnostic Errors; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood*; D007770:L-Lactate Dehydrogenase / Q000097:blood; D008297:Male; D015203:Reproducibility of Results; D014527:Uric Acid / Q000097:blood; D008258:Waldenstrom Macroglobulinemia / Q000097:blood* / Q000201:enzymology / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D007075:Immunoglobulin M; D014527:Uric Acid; D007770:L-Lactate Dehydrogenase; D000469:Alkaline Phosphatase