Which diagnostic finding is most specific for Guillain-Barré syndrome?

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Multiple Choice

Which diagnostic finding is most specific for Guillain-Barré syndrome?

In Guillain-Barré syndrome, the CSF often shows albuminocytologic dissociation: a high protein level with a normal cell count. This pattern occurs because peripheral nerve demyelination allows protein to leak into the CSF, while there isn’t a corresponding inflammatory cell pleocytosis in the CSF. Among the options, this combination is the most specific for GBS, since elevated protein with a high cell count would suggest an inflammatory or infectious process rather than a primarily demyelinating neuropathy. Decreased protein or normal protein with normal cells do not fit the typical GBS CSF profile. Keep in mind that the protein may take days to weeks to rise after symptom onset, so timing matters in interpretation.

In Guillain-Barré syndrome, the CSF often shows albuminocytologic dissociation: a high protein level with a normal cell count. This pattern occurs because peripheral nerve demyelination allows protein to leak into the CSF, while there isn’t a corresponding inflammatory cell pleocytosis in the CSF. Among the options, this combination is the most specific for GBS, since elevated protein with a high cell count would suggest an inflammatory or infectious process rather than a primarily demyelinating neuropathy. Decreased protein or normal protein with normal cells do not fit the typical GBS CSF profile. Keep in mind that the protein may take days to weeks to rise after symptom onset, so timing matters in interpretation.

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