A 60-year-old woman is found to have an elevated serum calci…

A 60-year-old woman is found to have an elevated serum calcium level on routine lab work. LMNP 10 years ago. CBC, CMP, TSH, and urinalysis are within normal limits. She has no other active medical problems. Follow up labs reveal a low parathyroid hormone level. What is the next best step in evaluating this patient’s hypercalcemia?