Review Question - QID 109979

A 27-year-old woman presents to her primary care physician because of headaches that she has had over the last three weeks. She has not had any significant past medical history though she does recall that various types of cancer run in her family. She has also noticed that she has been gaining some weight, and her feet no longer fit into her favorite shoes. On presentation, her temperature is 98.6°F (37°C), blood pressure is 159/92 mmHg, pulse is 75/min, and respirations are 16/min. Physical exam reveals 1+ edema in her lower extremities bilaterally. She is placed on captopril and presents to the emergency department two weeks later after a minor motor vehicle accident. She is cleared of any serious injuries, and as part of her workup, labs are drawn with the following results:

BUN: 47 mg/dL
Creatinine: 1.4 mg/dL

Which of the following findings would most likely also be seen in this patient?