Q. A 24-year-old sexually active man presents to the primary care clinic with a two-day history of a burning sensation, specifically at the start of urination. He denies any history of new sexual partners and reports consistent condom use. His medical history is unremarkable, and there is no reported incontinence, hematuria, or perineal pain. On physical examination, there is no urethral discharge, and the prostate is non-tender. Urinalysis reveals pyuria without evidence of nitrites or bacteria. No further laboratory tests have been performed. What would be the most appropriate next test in managing this patient?