A client tells the clinic nurse about experiencing burning on urination, and assessment reveals that the client had sexual intercourse four days ago with a person who was a casual acquaintance. Which action should the nurse implement?

A. Assess for perineal itching, erythema, and excoriation: These findings are more consistent with a fungal or irritant-related infection, not the primary concern in a client presenting with dysuria after recent sexual exposure. While useful, this does not immediately confirm the underlying cause. B. Obtain a specimen of urethral drainage for culture: Burning with urination after unprotected intercourse raises suspicion for a sexually transmitted infection such as gonorrhea or chlamydia. Obtaining a specimen allows accurate diagnosis and guides targeted antimicrobial therapy. C. Observe the perineal area for a chancroid-like lesion: Chancroid and syphilis typically present with ulcerative lesions, not isolated dysuria. While a physical exam is important, it will not confirm the cause as reliably as a culture for organisms that commonly cause urethritis. D. Identify all sexual partners in the last four days: Partner notification is a crucial step after a diagnosis of STI is established, but it is premature at this stage. Confirmation of infection through culture should occur before implementing public health reporting or partner tracing.