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Asthma is a heterogeneous disease, and one of the ongoing challenges in clinical practice is determining which patients are likely to benefit from anti-inflammatory treatment and which are not . Traditional tools—symptoms, spirometry, and peak flow—remain essential, but they do not always reflect underlying airway inflammation. Fractional exhaled nitric oxide (FeNO) testing helps address this gap. FeNO testing, widely used internationally and increasingly adopted in community

Asthma can feel unpredictable. Some days breathing feels normal, while other days symptoms such as cough, chest tightness, or shortness of breath can appear without warning. One reason asthma can be hard to manage is that symptoms do not always reflect what is happening inside the airways. A test called FeNO (fractional exhaled nitric oxide)  can help provide additional clarity. What Is FeNO Testing? FeNO is a simple, non-invasive breathing test  that measures a natural gas i