FeNO
Medical abbreviation · Respiratory
| Stands for | Fractional exhaled nitric oxide |
|---|---|
| Categories | Medical |
FeNO stands for Fractional exhaled nitric oxide, a respiratory abbreviation.
Breath test measuring nitric oxide in exhaled air, in parts per billion, a marker of type 2 (eosinophilic) airway inflammation. High values support an asthma diagnosis and predict response to inhaled corticosteroids.
Example: FeNO 68 ppb with variable airflow obstruction supports asthma; start ICS.
Usage notes
The American Thoracic Society (2011) considers values above 50 ppb in adults high and below 25 ppb low. Smoking lowers readings, while recent eating of nitrate-rich foods and viral infections can raise them. The test takes a few minutes and requires a steady exhalation. Capitalization varies (FENO, FeNO).
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This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.