A 35-year-old man is found to have serum calcium 7.2 mg/dL (normal 8.5–10.5), serum phosphate 5.8 mg/dL (normal 2.5–4.5), and PTH 12 pg/mL (normal 15–65) on routine blood work. He is asymptomatic. Which investigation is most appropriate to establish the underlying cause of hypocalcemia?

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