A 69-year-old man arrives in the ED with reports of persistent fatigue, nausea, vomiting, anorexia, excessive thirst, increased urination, and back pain for 3 days. His medications include oral hydrochlorothiazide, oral cholecalciferol, oral atorvastatin, and subcutaneous teriparatide. The ED nurse obtains orders for a CBC, CMP, parathyroid hormone level, vitamin D, urinalysis, and electrocardiogram. The patient’s calcium level is 13.5 mg/dL.
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