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Housecall, our weekly general-interest e-newsletter, keeps you up to date on a wide variety of health topics with timely, reliable, practical information, recipes, blogs, questions and answers with Mayo Clinic experts and more. Our biweekly topic-specific e-newsletters also include blogs, questions and answers with Mayo Clinic experts, and other useful information that will help you manage your health.
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Definition
By Mayo Clinic staffAn exhaled nitric oxide test is one of several tests that can be used to check for asthma. A nitric oxide test involves breathing into a mouthpiece attached to a machine that can measure the level of nitric oxide in your breath. Nitric oxide gas is produced by the body normally, but high levels in your breath can mean your airways are inflamed — a possible sign of asthma. A relatively new tool for measuring asthma, the nitric oxide test is available in only some hospitals and doctor's offices.
- 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.
