メディカル道場コミュの初段レベル－3

A 34-year-old woman comes to your clinic for evaluation of elevated serum calcium level of 11.0 mg/dL that was found at her recent annual check-up. All other laboratory results are normal. The patient is healthy with no symptoms of polyuria, constipation, or fatigue. Her family history reveals that her mother and maternal grandfather have a history of hyperparathyroidism, and they both underwent parathyroidectomy but remained mildly hypercalcemic. Her diet is rich in dairy products, and she has no history of gastrointestinal illness. Her vital signs and physical examination are normal. The parathyroid hormone (PTH) level is within normal limits. Her renal ultrasound shows no evidence of nephrolithiasis.

What is the most likely diagnosis?

What test would be most likely to confirm the diagnosis?