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Spirometry Interpretation — RACP Paediatrics MCQ

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ModerateRespiratorySpirometry InterpretationRACP Paediatrics

A 6-year-old is undergoing spirometry for the first time. His FEV1 is 78% predicted and FVC is 92% predicted. After administration of salbutamol, FEV1 increases by 15% from baseline. How is this interpreted?

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Correct answer: E — Obstructive pattern with positive bronchodilator reversibility

FEV1 <80% predicted with preserved FVC (FEV1/FVC ratio reduced) indicates an obstructive pattern. A ≥12% improvement in FEV1 after bronchodilator confirms significant reversibility, consistent with asthma.

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