A 56-year-old woman is found to have hypercalcemia during a routine checkup. She has history of asthma on ICS/LABA. She is an active smoker. No family history of hypercalcemia. Her vital signs are stable. Neurogenic examination shows no focal deficits and deep tendon reflexes are normal. Laboratory results are as follows: Hematocrit: 43% (normal 36% – 46%) Leukocytes: 6,300/mm3 (normal 4500 – 11,000/mm3) Platelets: 200,00/mm3 (normal 150,000 – 400,000/mm3) Serum calcium: 11.2 mg/dL (normal 8.4 – 10.2 mg/dL) Serum albumin: 4.0 g/dL (normal 3.5 – 5.5 g/dL) Serum creatinine: 1.0 mg/dL (normal 0.6 – 1.2 mg/dL) Serum calcium year ago was 10.9 mg/dL Which of the following is the best next step?