A 15 year old boy presents with recurrent breathlessness and wheeze especially after exercise. What is the most diagnostic investigation?
belongs to book: 1700 MCQ REVISED VERSION TOPIC WISE|DR. KHALID SAIFULLAH|4th EDITION| Chapter number:19| Question number:73
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The key is B. Lung function test. [Assessment of severity of airflow obstruction can diagnose asthma and COPD].
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