Highly sensitive, automated immunoassay for immunoglobulin free light chains in serum and urine

Arthur Bradwell, HD Carr-Smith, Graham Mead, Lian Tang, PJ Showell, Mark Drayson, R Drew

Research output: Contribution to journalArticle

541 Citations (Scopus)


BACKGROUND: Bence Jones proteins or monoclonal immunoglobulin kappa and lambda free light chains (FLCs) are important markers for identifying and monitoring many patients with B-cell tumors. Automated immunoassays that measure FLCs in urine and serum have considerable clinical potential. METHODS: Sheep antibodies, specific for FLCs, were prepared by immunization with pure kappa and lambda molecules and then adsorbed extensively against whole immunoglobulins. The antibodies were conjugated onto latex particles and used to assay kappa and lambda FLCs on the Beckman IMMAGE protein analyzer. RESULTS: The unconjugated antibodies showed minimal cross-reactivity with intact immunoglobulins or other proteins. With latex-conjugated antibodies, kappa and lambda FLCs could be measured in normal sera and most normal urine samples. Patients with multiple myeloma had increased concentrations of the relevant serum FLC, whereas both FLCs were increased in the sera of patients with systemic lupus erythematosus. CONCLUSIONS: We developed sensitive, automated immunoassays for kappa and lambda FLC measurements in serum and urine that should facilitate the assessment of patients with light chain abnormalities.
Original languageEnglish
Pages (from-to)673-80
Number of pages8
JournalClinical Chemistry
Issue number4
Publication statusPublished - 1 Jan 2001


Dive into the research topics of 'Highly sensitive, automated immunoassay for immunoglobulin free light chains in serum and urine'. Together they form a unique fingerprint.

Cite this