Through our experience, we have analyzed the value of immunological exploration, namely the calculation of the IgG index and isoelectrofocalization (IEF) in the detection of IgG IS for the diagnosis of multiple sclerosis (MS), a chronic inflammatory demyelinating disease of the central nervous system (CNS). To this end, we conducted a study involving 223 patients with suspected MS for whom a CSF immunoassay was requested. There were 2 groups of patients:...