system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
35 yr old female with ptosis & proximal muscle weakness. Test to be done for diagnosis - (REPEATED)
assistant
The correct answer is  Harrison's principles of internal medicine 17t edition. *Single fibre electromyography ,blocking and jitter ,with normal fiber density,confirmatory.