Review Question - QID 210379

A 23-year-old woman presents to the emergency department with pain and frequent urination. She states she has felt uncomfortable with frequent small-volume urinary voids for the past 3 days, which have progressively worsened. The patient has no past medical history. She currently smokes 1 pack of cigarettes per day and engages in unprotected sex with 2 male partners. Her temperature is 103°F (39.4°C), blood pressure is 127/68 mmHg, pulse is 97/min, respirations are 17/min, and oxygen saturation is 98% on room air. Cardiac, pulmonary, and abdominal exams are within normal limits. There is tenderness upon palpation of the left costovertebral angle and the left flank. Urine is collected and a pregnancy test is negative. Which of the following is the most appropriate next step in management?