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
A 22-year-old woman presents with progressive hearing loss for the past 4 months. She says that she isn’t hearing high frequency sounds like she used to, especially in large rooms. Her past medical history shows significant bilateral lens dislocations 6 months ago. Family history reveals that her mother had chronic hematuria and her grandfather suffered from corneal dystrophy and died from renal failure at age 51. The vital signs include: blood pressure 145/95 mm Hg, pulse 78/min, and respiratory rate 19/min. On physical examination, the patient has mild to moderate bilateral sensorineural high-frequency hearing loss. A slit-lamp examination is shown in the exhibit (see image). The remainder of the exam is unremarkable. Laboratory findings are significant for microscopic hematuria. Which of the following tests would most likely confirm the diagnosis in this patient?
assistant
Skin biopsy