A 32-year-old woman presents to the physician for a routine health maintenance examination. She reports a dry cough for the past three months. Chest x-ray shows nodularity around the mediastinum. Laboratory studies are as follows:
Serum angiotensin-converting enzyme (ACE): Elevated
Serum calcium: 10.6 mg/dL (NR 8.4-10.2)
Serum phosphate: 4.2 mg/dL (NR 2.5-4.5)
Serum PTH: 14 pg/mL (NR 10-55)
Which of the following is the most likely explanation for these findings?
Decreased secretion of PTH
Decreased serum magnesium
Increased hydroxylase activity
Increased kallikrein activity
Increased secretion of PTHrp
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Cut-to-the-chase Answer (1:01):
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HY USMLE Answer (5:12):
