A patient with progressively deteriorating lower extremity motor and sensory function is having a lumbar puncture. What finding suggests that this patient has Guillain-Barré syndrome (GBS)?

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Elevated protein level in the cerebrospinal fluid (CSF) is a hallmark finding in Guillain-Barré syndrome (GBS), often with a normal white blood cell count, a pattern known as albuminocytological dissociation.

A Patient with Progressively Deteriorating Lower Extremity Motor and Sensory