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 64-year-old female presents to her primary care physician for an annual checkup. She states that her health is adequate, but she has not been doing well since her husband died last year. She is able to get by but admits to having trouble caring for herself, cooking, cleaning, and paying her bills. The patient complains of diffuse muscle aches and pains. She has a past medical history of anxiety and seasonal affective disorder. She is not currently taking any medications. On physical exam, you note a gaunt woman with a depressed affect. You note that her body mass index (BMI) and height have both decreased since her last annual visit. On physical exam, her cardiac, pulmonary, and abdominal exams are within normal limits. Lab work is drawn and is as follows:

Serum:
Na+: 135 mEq/L
K+: 3.7 mEq/L
Cl-: 100 mEq/L
HCO3-: 23 mEq/L
Urea nitrogen: 7 mg/dL
Glucose: 70 mg/dL
Creatinine: 0.8 mg/dL
Ca2+: 8.0 mg/dL
Mg2+: 1.5 mEq/L
Parathyroid hormone: 855 pg/mL
Alkaline phosphatase: 135 U/L
Phosphorus: 2.6 mg/dL

Hemoglobin: 14 g/dL
Hematocrit: 36%
Platelet count: 187,000/mm^3
Leukocyte count: 4,700/mm^3

What is the most likely diagnosis?
assistant
Osteomalacia