The use of fractional exhaled nitric oxide is valuable in select asthmatic patients.

Clinical management of asthma is challenging and measuring fractional exhaled nitric oxide (FeNO) can be another tool to assist in meeting this challenge.Asthma is a heterogeneous condition. There are many different phenotypes. FeNO can help the physician identify which patients have eosinophilic inflammation and would potentially respond to corticosteroid therapy.FeNO is a complement to standard asthma care. FeNO can be used in the initial diagnosis of asthma and aid in stratification of which patients would be steroid responsive but also for assessment of disease severity, response to treatment, and compliance.