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 42-year-old woman presents with fatigue. She says that her symptoms have gradually onset after she recently had a total thyroidectomy due to Graves’ disease. Past medical history is otherwise unremarkable. The patient is afebrile, and her vital signs are within normal limits. Physical examination is unremarkable. Laboratory findings are significant for the following:
  Potassium 4.2 mEq/L
  Calcium 7.8 mg/dL
  Chloride 102 mEg/L
  Vitamin D3 8 ng/mL (ref range: 25–80 ng/mL)
A deficiency of which of the following is the most likely cause of this patient’s symptoms?
assistant
Parathyroid hormone (PTH)