CSF Free Kappa Light Chain for The Diagnosis of Demyelinating Disorders

Multiple sclerosis (MS) is a demyelinating disease of the central nervous system (CNS) which commonly leads to disability. The current preferred clinical laboratory test for the diagnosis is the detection of oligoclonal bands (OCBs) in the cerebrospinal fluid (CSF) by isoelectric focusing electrophoresis (IEF) followed by immunoblotting.Measuring the levels of Kappa Free Light Chain (K-FLC) in CSF has been proposed as a potential alternative to the qualitative assessment of OCBs. The aim of this study is to validate and determine the diagnostic yield of K-FLC in CSF against OCBs via IEF as gold standard.