27th June 2023

A 56-year-old man attends chemotherapy for a small cell lung carcinoma. He reports gradual onset limb weakness

A 56-year-old man attends chemotherapy for a small cell lung carcinoma. He reports gradual onset limb weakness, associated with intermittent diplopia. On examination, he has left-sided ptosis, proximal myopathy, and reduced tendon reflexes.

Select the SINGLE most likely neuroimmunology test that would help in diagnosis from the list below. Select ONE option only.