Soru

During a new patient evaluation, a 34-year-old female is noted to have a blood pressure of $158/96$ mm Hg. She returns to the clinic two weeks later for a follow-up, and her blood pressure is $154/94$ mm Hg. The patient reports feeling entirely well, with no headaches, palpitations, or muscle weakness. She has no known medical conditions and takes no medications or over-the-counter supplements. She does not use tobacco or illicit substances. Her body mass index is $23$ kg/m $^2$. Physical examination reveals normal pulses in all extremities and no abdominal bruits. A comprehensive metabolic panel is obtained to assess baseline organ function, demonstrating a serum sodium of $143$ mEq/L, serum potassium of $3.1$ mEq/L, serum chloride of $103$ mEq/L, serum bicarbonate of $29$ mEq/L, and serum creatinine of $0.8$ mg/dL. Which of the following is the most appropriate next step in the diagnostic workup for this patient?