Medicine A 35 year old female has proximal weakness of muscles, ptosis and easy fatigability. The most sensitive test to suggest the diagnosis is: A Muscle Biopsy B CPK levels C Edrophonium test D Single fiber EMG 💡 Explanation A 35 year old female has proximal weakness of muscles, ptosis and easy fatigability. The most sensitive test to suggest the diagnosis is: ✓ Correct Answer: D. Single fiber EMG