A 22-year-old college student comes to the primary care clinic because he is concerned about his high calcium level. Two days ago, he went to the emergency room for a severe cough. Some blood tests were done and he was told, ‘Your serum calcium level is high and you should follow up with your primary care physician’. He recovered from his cough and has no medical problems today. His past medical history is unremarkable. His family history is remarkable for parathyroid disorders and some of them had to undergo parathyroidectomy. You reviewed his medical record from his emergency room visit, and the laboratory results were given below. Which of the following is the most likely diagnosis in this patient?
