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Usually a neurologist, but any healthcare professional familiar with the GBS symptoms may make the correct initial diagnosis. Symptoms typically include leg weakness, ascending paralysis (numbness) usually beginning in the feet & gradually working upward into the legs.Severe low back pain is often present. Diagnosis is usually confirmed by lumbar puncture to obtain about 15cc of spinal fluid for lab diagnosis for protein level in the fluid - high protein levels confirm the GBS diagnosis.