What is the preferred test for detecting gonorrhea and chlamydia?

• A. Serology
• B. NAAT
• C. Culture
• D. Gram stain

Answer: (B)

Detecting gonorrhea and chlamydia relies on tests that identify the organisms themselves with high accuracy. Nucleic acid amplification tests are the preferred method because they have high sensitivity and specificity for both pathogens across a wide range of specimen types, including urine and swabs from the cervix, vagina, urethra, as well as pharyngeal and rectal sites. This capability makes NAAT excellent for screening asymptomatic individuals and for diagnosing infections at non-genital sites, leading to reliable detection and timely treatment.

Serology isn’t useful for acute mucosal infections like gonorrhea or chlamydia because it measures antibodies that reflect past exposure and has limited diagnostic value for current infections. Gram stain can be helpful in a very specific clinical scenario (symptomatic men with discharge) but performs poorly in women and for extragenital infections. Culture, while specific and important for antibiotic susceptibility testing in some settings, is slower and less sensitive overall and requires careful handling, making it a less favorable first-line option compared with NAAT.