 The measurement of exhaled nitric oxide FeNO is the only clinical test for measuring airway inflammation that can be performed consistently and accurately in clinical practice at the point-of-care. Airway inflammation is now recognized as the central mechanism in the pathogenesis of asthma. The measurement of FeNO with the NIOX MINO device provides a rapid, noninvasive, and inexpensive tool to assess airway inflammation in inflammatory airway diseases such as asthma. The test is easy to perform and requires minimal training for the operator to conduct the test. 