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Calcium and Bone Metabolism: Review Questions

Choose the single best answer for each question. Questions 1 and 2 refer to the following case study. A 55-year-old woman with a history of sarcoidosis and Graves’ disease who is taking corticosteroids and antithyroid medication is hospitalized because of hemoptysis. Results of initial laboratory measurements show a serum calcium level of 10.9 mg/dL (normal, 8.8–10.2 mg/dL); further testing reveals an intact parathyroid hormone level of 50 pg/mL (normal, 10–65 pg/mL).