Kappa free light chain index or oligoclonal bands testing in clinical practice for multiple sclerosis diagnosis: An algorithm comparative study. Levraut M, Cohen M, Sterlin D, Ayrignac X, Bigaut K, Zéphir H, Ciron J, Camdessanché J-P, Casez O, Moreau T, et al. Mult Scler. 2026 May 06:13524585261442020. PMID: 42091137. Abstract CommentRecommendBookmarkWatch