How often are neurophysiologic testing findings negative in Guillain-Barre syndrome (GBS)?

Updated: Jul 14, 2021
  • Author: Michael T Andary, MD, MS; Chief Editor: Milton J Klein, DO, MBA  more...
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In some cases, neurophysiologic testing is normal in patients with GBS, especially in the first 1-2 weeks of the disease. This is believed to be due to the location of demyelinating lesions in proximal sites not amenable to study. [110]  For example, a retrospective, single-center study by Luigetti et al found that in 37% of patients with GBS who underwent an early nerve conduction study (ie, 4 days or less after disease onset), neurophysiologic results were normal. As a result, the investigators, whose study involved 71 patients with GBS, suggested that extensive neurophysiologic assessment should be performed in patients who are in the early phases of GBS. [112]

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