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Intrathecally synthesized IgGs are typically observed in patients with multiple sclerosis. The current standard protocol for the detection of OCBs is IEF on agarose or polyacrylamide gels followed by immunoblotting or silver staining. These methods are time consuming, show substantial interlaboratory variation and cannot be used in a high throughput\u2010approach. We have developed a new nanoscale method for the detection of OCBs based on automated capillary IEF followed by immunological detection. Evidence for intrathecal IgG synthesis was found in all tested patients (<jats:italic>n<\/jats:italic> = 27) with multiple sclerosis, even in two subjects who did not have oligoclonal bands according to standard methods. The test specificity was at 97.5% (<jats:italic>n<\/jats:italic> = 19). Our findings indicate that the novel OCB\u2010CIEF\u2010immunoassay is suitable for the rapid and highly sensitive detection of OCBs in clinical samples. 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