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STI screening – Chlamydia — RACP Paediatrics MCQ

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HardIDSTI screening – ChlamydiaRACP Paediatrics

A 16-year-old requests an asymptomatic STI check. He reports receptive oral and anal sex with male partners and inconsistent condom use. He is hepatitis-B immune and has no known contact. Which sampling strategy is most appropriate?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: D — Obtain urine, pharyngeal and rectal NAATs plus HIV and syphilis serology

Explanation lettering: B = shown as A · A = shown as B · D = shown as C · C = shown as D

C is correct because Australian STI guidance tailors NAAT specimens to exposed anatomical sites and includes HIV and syphilis serology in an asymptomatic check; urine alone misses pharyngeal and rectal infection. A under-samples the stated exposures. B omits common asymptomatic chlamydia and gonorrhoea. D uses tests not recommended for routine asymptomatic herpes or warts and substitutes culture for NAAT. E is insensitive in asymptomatic infection and ignores extragenital sites and blood-borne infections. Confidentiality, consent, vaccination and a safe method for communicating results should be addressed alongside testing.

Reference: Australian STI Management Guidelines, young people: https://sti.guidelines.org.au/populations-and-situations/young-people/