The serum-free light chain (SFLC) assay provides useful information in patients with plasma cell dyscrasias who secrete no or small quantities of monoclonal protein.[1][1],[2][2] Changes in SFLC over a period of time correlate with changes in the amounts of 24-hour urinary monoclonal protein.[3][3]
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Singhal et al. (2007) studied this question.
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