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Free lambda value improved to 45 mg/L and light chain ratio normalized.
Urine protein electrophoresis and immunofixation electrophoresis showed a free lambda light chain.
Serum free lambda light chain was markedly elevated at 901 mg/L with a very low ratio at 0.09.
Further laboratory studies revealed decreased serum immunoglobulin levels (IgA 0.35 g/L, reference value 0.7-3.8 0.7-3.8M 0.26 g/L, reference value 0.6-2.5 g/L), elevated free lambda lIgMt-chain levels, and an abnormal ratio of free kappa to free lambda light chains.
Oligoclonal fLC bands of the kappa type are seen in MS at approximately the same frequency as oligoclonal IgG; oligoclonal free lambda light chains are less frequently observed [ 18, 23].
Samples were assessed for total IgG, total IgA and total IgM (Dade Behring, Siemens, Germany), serum free kappa (FLC κ) and serum free lambda (FLCλ) light chains (Freelite, The Binding Site Group Ltd ,Birmingham, UK) and cystatin C (The Binding Site Group Ltd).
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We have tested commercially available purified human Bence Jones kappa and lambda free light chains and were able to detect 0.375 ng of free κ and 1.5 ng of free λ protein.
Free kappa and lambda light chains.
A new immunoassay which quantifies Kappa, Lambda free light chains (FLC) and a ratio of Kappa to Lambda FLC has been reported to be sensitive for detecting a variety of FLC diseases.
The sIFE was performed to detect kappa and lambda free light chains in sera.
Both kappa and lambda free light chain concentrations were measured quantitatively to calculate the kappa/lambda FLC ratio.
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