How Is Asthma Diagnosed?

Spirometry

Spirometry is a common test used in doctor's offices to assess how well a patient's lungs work. It measures the amount of air individuals inhale, the amount of air they exhale, and how fast they exhale. In addition to diagnosing asthma, spirometry can diagnose chronic obstructive pulmonary disease (COPD) and other breathing conditions. Doctors might periodically use spirometry to monitor the condition of a patient's lungs and make sure their asthma treatment is working correctly. For patients who have already been diagnosed with asthma, spirometry might be used to monitor treatment or to make sure their lung function is adequate before surgery. Spirometry is generally considered a safe diagnostic test, though patients might feel dizzy or short of breath momentarily after the test is performed. Patients do have to undergo some exertion, so the test isn't used for those who have heart conditions or who have recently experienced a heart attack. Before taking the test, patients should wear loose clothing and avoid eating large meals.

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