Review Question - QID 210401

A 33-year-old woman presents to her primary care provider for a normal check-up. She reports she has been feeling intermittently fatigued over the past 3 months, but she attributes it to her work as a corporate lawyer and balancing family life. She is otherwise healthy and takes no medications. She was adopted and has no information about her biological family. She has 2 children and has been married for 7 years. She drinks 4-5 glasses of wine per week and does not smoke. Her temperature is 99.2°F (37.3°C), blood pressure is 125/65 mmHg, pulse is 78/min, and respirations are 18/min. On exam, she is well-appearing and in no acute distress. A complete blood count is within normal limits. Additional workup is shown below:

Serum:
Na+: 139 mEq/L
Cl-: 99 mEq/L
K+: 3.9 mEq/L
HCO3-: 23 mEq/L
BUN: 18 mg/dL
Glucose: 110 mg/dL
Creatinine: 1.1 mg/dL
Ca2+: 11.1 mg/dL
Parathyroid hormone: 700 pg/mL

Urine:
Na+: 100 mEq/L/24h
Ca2+: 100 mg/24h
Osmolality: 400 mOsmol/kg H2O

Which of the following is the most likely underlying cause of this patient's condition?