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A 12 year old boy comes to chest clinic with an episode of chest tightness and ...
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A 12 year old boy comes to chest clinic with an episode of chest tightness and wheezes. His mother tells the pulmonogist that he his nebulizer sessions improve his chest condition. The pulmonogist suspects that the boy has bronchial asthma.
What is the single best investigation to confirm that the boy has bronchial asthma?
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