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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (typically in serum, but also in urine) to determine kappa light chains, as fragments of monoclonal immunoglobulins (paraproteins). The presence of kappa light chains Ig in serum is used in the diagnosis of some malignant neoplasms, such as multiple myeloma, plasmacytoma, and amyloid disease.
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