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Vaccination in Indigenous communities — MCCQE Part 1 MCQ

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ModeratePreventive MedicineVaccination in Indigenous communitiesMCCQE Part 1

A long-term radon test in a family's normally occupied basement office shows an annual average of 320 Bq/m³. No household member has respiratory symptoms. What should the clinician recommend?

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Correct answer: B — Arrange certified mitigation within one year

The annual average exceeds Health Canada's guideline of 200 Bq/m³ in a normally occupied area. Recommend corrective action within one year, sooner as concentrations rise, using a certified radon-mitigation professional and confirming the post-mitigation level. Symptoms are not a useful trigger because radon-related lung-cancer risk accrues silently. Ordinary air purifiers do not remove soil gas, and screening chest radiographs do not substitute for source control. Smoking cessation remains important because tobacco and radon risks interact.

Reference: Health Canada Radon Guideline: https://www.canada.ca/en/health-canada/services/health-risks-safety/radiation/radon/government-canada-radon-guideline.html