Exhaled Nitric Oxide is elevated when there is eosinophilic inflammation of the lungs, which is a marker for asthma diagnosis. FeNO is not commonly used in primary care in Wales, but it features alongside spirometry with reversibility and a PEF diary as an important step in diagnostic pathways for Adult Asthma.

In this episode of the TV show we explore the valuable role of FeNO in Asthma diagnosis and management.