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 25-year-old woman comes to the physician for a pre-employment examination. Her current medications include an oral contraceptive and a daily multivitamin. Physical examination is unremarkable. Serum studies show calcium of 11.8 mg/dL, phosphorus of 2.3 mg/dL, and parathyroid hormone level of 615 pg/mL. A 24-hour urine collection shows a low urinary calcium level. Which of the following is the most likely underlying cause of this patient’s laboratory findings?
assistant
Defect in calcium-sensing receptors