ADC Practice Question — Testing After Exposure

What is the window period during which HBV testing may produce false-negative results?

Infection control in the ADC exam tests decision-making around exposure incidents, instrument classification, and decontamination protocols. This exam-level vignette tests your ability to work through clinical details and arrive at the correct management.

Dr Mehta's dental assistant sustains a needlestick injury from a needle used on Mrs Garcia (58F), who is known to be hepatitis B positive (HBsAg positive, HBe-antigen positive). The assistant is unsure of her own HBV vaccination status. The practice must manage both the injured worker and the source patient appropriately. What is the window period during which HBV testing may produce false-negative results?

A. 2 weeks
B. 1 month
C. 3 months
D. 6 months

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Sources cited

Therapeutic Guidelines v4 Odell's 3rd & 4th Ed IADT 2020 Code of Conduct CMS (Evans) Infection Control + more

Show the answer and cited explanation

Correct answer: D

The window period for HBV is 6 months — during this time, testing may produce false-negative results. The window period for HCV is also 6 months. For HIV, the window period is usually up to 3 months (PCR testing can identify 90% within 4 weeks). (ICG p.83)

Source: ICG Appendix: Window Periods

Remy's study tip — The differentiator is usually the Spaulding classification level or the step order in a protocol.

Exam preparation FAQ

How do I approach an unfamiliar Testing After Exposure vignette?

Extract key clinical data from the stem before reading options. There are usually 3–4 critical variables that determine the correct answer.

How should I prepare for Infection Control in the ADC exam?

Build competence across all topics. The exam tests application of guidelines to clinical scenarios, not memorisation.

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