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Why it's done
By Mayo Clinic staffNitric oxide testing is done to help diagnose asthma or see how well asthma medications are working. If you've already been diagnosed with asthma, your doctor may use a nitric oxide test during office visits to see if your asthma is under control. If the diagnosis of asthma is uncertain, your doctor may use a nitric oxide test to confirm that you have asthma.
While nitric oxide testing can be a helpful tool to evaluate signs of asthma, no one test can give an exact measurement of your asthma. For this reason, nitric oxide tests are done along with lung function tests such as peak flow measurement and spirometry, which check how well you can breathe.
- Stewart L. Exhaled nitric oxide. Immunology and Allergy Clinics of North America. 2007;27:571.
- American Thoracic Society. ATS/ERS recommendations for standardized procedures for the online and offline measurement of exhaled lower respiratory nitric oxide and nasal nitric oxide, 2005. American Journal of Respiratory and Critical Care Medicine. 2005;171:912.
