A 62-year-old woman is referred to your clinic for evaluation of hypercalcemia. She has a history of hypertension and vitamin D deficiency. Her medications include hydrochlorothiazide and vitamin D supplements. Laboratory investigations are as follows:
Calcium: 2.72 mmol/L (↑)
Phosphate: 0.9 mmol/L (↓)
Parathyroid hormone (PTH): 0.9 pmol/L (↓)
25-hydroxy vitamin D: 80 nmol/L (normal)
Which one of the following is the best next step?
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