Peter Lange, Charlotte Suppli Ulrik & Ole Hilberg:
Fraction of exhaled nitric oxide as biomarker of asthmatic airway inflammation
Ugeskr Læger 2019;181:V11180816
Fraction of exhaled nitric oxide (FeNO) is an easily available online biomarker, which correlates with the presence of type 2 inflammation in the airways. Measurements of FeNO together with clinical assessment and spirometry have the potential to improve diagnosis and management of patients with chronic airway symptoms. High values of FeNO in patients with relevant symptoms increase the probability of asthma and a favourable response to inhaled corticosteroids, but low values can be seen in various subtypes of asthma and in asthmatic patients, who smoke.