FENO Test

The American Thoracic Society (ATS) strongly recommends the use of FeNO measurement to aid in the assessment, management, and long-term monitoring of asthma.5 In their 2011 clinical practice guideline, the ATS emphasizes the importance of using FeNO to
Understand possible causes of respiratory symptoms where there is no diagnosis of asthma
Ensure appropriate treatment with anti-inflammatory medications, especially corticosteroids
Patients with asthma caused by allergic airway inflammation have high levels of FeNO that decrease with corticosteroid treatment. Knowing whether Pulmonary airway inflammation is present can help avoid an empiric trial of steroids