Mayo Clinic Q and A: Test can be helpful in diagnosing asthma

DEAR MAYO CLINIC: I’ve had a cough and some wheezing that won’t go away. My doctor suspects asthma and ordered an exhaled nitric oxide test. Can you tell me more about this test? ANSWER: Asthma is usually diagnosed based on symptoms, a physical exam and certain tests — such as peak flow measurement and spirometry tests [...]
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