What is not useful for diagnosis of myasthenia gravis?: (A) AChR antibodies, (B) Voltage gated calcium channel antibodies, (C) Muscle-specific kinase antibodies, (D) Edrophonium test
Answer is B. Voltage-gated calcium channel antibodies are used for diagnosis of Lambe Eaton syndrome. Choices A, C,and D are used for diagnosis of M. Gravis.