Review Question - QID 213615

A 25-year-old woman with a past medical history of anxiety and depression presents to the emergency department with increased urination. She states that for the past 3 days she has been urinating a large volume of clear urine. She states she is going to the bathroom over 10 times per day. Otherwise, she states she feels well. Her temperature is 97.5°F (36.4°C), blood pressure is 122/82 mmHg, pulse is 85/min, respirations are 15/min, and oxygen saturation is 98% on room air. The patient’s neurologic exam is within normal limits. Laboratory values are ordered as seen below.

Serum:
Na+: 129 mEq/L
Cl-: 99 mEq/L
K+: 4.0 mEq/L
HCO3-: 24 mEq/L
BUN: 20 mg/dL
Glucose: 90 mg/dL
Creatinine: 0.9 mg/dL
Ca2+: 10.0 mg/dL

The patient’s urinalysis is currently pending. Which of the following is the most appropriate next step in management?