Document Detail

Effect of sample dilution on serum free light chain concentration by immunonephelometric assay.
MedLine Citation:
PMID:  21740895     Owner:  NLM     Status:  Publisher    
BACKGROUND: Free light chains (FLC) are useful biomarkers in the assessment of plasma cell disorders. Concerns have been raised about some technical aspects of the assay. This report examined the occurrence of dilution anomalies and/or antigen excess. METHODS: FLC were determined on a BNII instrument at at-least two dilutions (100- and 2000-fold) in 2088 consecutive samples from 865 different patients. In part of them, the 400-fold dilution was also available. RESULTS: Higher than 2-fold differences and inconsistencies ["<" or ">" result at one dilution not consistent with the result obtained at another dilution] between the 100- and 2000-fold dilutions were found in 12.7% of patients for κ FLC and in 3.1% of patients for λ FLC. More than 4-fold differences between results obtained at the 2000-fold and the 100-fold dilutions were observed in 5.4% of patients for κ FLC and in 1.2% of patients for λ FLC. CONCLUSIONS: The FLC assay on BNII suffers from sample dilution anomalies and/or failure of antigen excess detection in a substantial fraction of patients. Laboratory professionals and clinicians should be alert to such analytical difficulties.
Martine Vercammen; Patricia Meirlaen; Linda Broodtaerts; Isabelle Vande Broek; Xavier Bossuyt
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-29
Journal Detail:
Title:  Clinica chimica acta; international journal of clinical chemistry     Volume:  -     ISSN:  1873-3492     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-7-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1302422     Medline TA:  Clin Chim Acta     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier B.V.
Laboratory of Haematology, Universitair Ziekenhuis Brussel, Belgium.
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