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Methacholine Challenge Test Defined

A methacholine challenge test helps determine how your lungs are functioning. It is often used if a physical examination and spirometry test are inconclusive regarding a diagnosis of asthma. During a methacoline challenge, you inhale increasing amounts of methacholine aerosol mist. After each dose of methacholine, spirometry will be performed to measure any resulting changes in your lung function.

Learn more about asthma symptoms, diagnosis, treatment and management.