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Asthma — RACP Paediatrics MCQ

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EasyRespiratoryAsthmaRACP Paediatrics

A 6-year-old boy presents with wheeze and dry cough mainly at night and early morning. Spirometry shows an FEV1 of 82% predicted which improves to 95% after salbutamol. Which investigation result confirms asthma?

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Correct answer: E — Improvement in FEV1 of ≥12% post-bronchodilator

Demonstration of variable expiratory airflow limitation is key to confirming asthma. An improvement in FEV1 of ≥12% (and >200 mL in older children) following bronchodilator confirms significant reversibility. Atopy, raised FeNO, and eosinophilia may support the diagnosis but are not diagnostic on their own.

Reference: National Asthma Council Australia – 2024 – Australian Asthma Handbook