Best test for Chlamydia in a patient with vaginal irritation and partner positive?

• A. NAAT
• B. Vaginal culture
• C. Serology
• D. Wet mount

Answer: (A)

Nucleic acid amplification testing (NAAT) is the preferred method for diagnosing Chlamydia because it detects the bacteria’s genetic material with very high sensitivity and specificity. NAAT can be done on easily obtainable specimens such as a vaginal swab or first-void urine, making it practical for symptomatic patients and those with a partner who is positive. In contrast, vaginal culture, while historically used, is more labor-intensive and less sensitive, and often not as readily available. Serology is not reliable for acute genital chlamydia because antibodies may reflect past infections and do not indicate current infection, and a wet mount only helps identify other causes of vaginal irritation (like yeast or BV) rather than Chlamydia. This combination of accuracy, practicality, and broad applicability makes NAAT the best test in this scenario.