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  • Title: Cerebrospinal fluid oligoclonal IgM in multiple sclerosis: analytical problems and clinical limitations.
    Author: Giles PD, Wroe SJ.
    Journal: Ann Clin Biochem; 1990 May; 27 ( Pt 3)():199-207. PubMed ID: 2200331.
    Abstract:
    A method for detecting cerebrospinal fluid (CSF) oligoclonal IgM is described. Concentrated CSF was separated by agarose isoelectric-focusing and blotted with poly(vinyldifluoride). A double-antibody immunoperoxidase technique with avidin-biotin amplification was used to stain IgM. Special conditions were required to avoid cross-reaction with IgG. The method was applied to 99 patients on whom oligoclonal IgG analysis was performed. Positive IgM results occurred in 17 of the 27 patients positive for oligoclonal IgG, and in two patients negative for oligoclonal IgG, neither of whom had multiple sclerosis (MS). Fifteen of the patients positive for oligoclonal IgM had some IgM bands in their sera. Oligoclonal IgM was not found in the CSF of suspected MS patients without oligoclonal IgG, but occurred in several patients with oligoclonal IgG due to other diseases. As a test for MS, oligoclonal IgM was less sensitive than oligoclonal IgG and did not improve specificity.
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