FENO (Breath Test)
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FENO (Breath Test)
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FENO(Breath Test): The FENO (Fractional exhaled Nitric Oxide) test is a simple, quick, and painless breathing test used to measure the amount of nitric oxide in your breath. Nitric oxide is a gas naturally produced in your lungs, and its level can indicate inflammation in the airways — especially the type seen in asthma and some other lung conditions.
Why is it Done?
Doctors use the FeNO test to:
- Help diagnose asthma
- Check how much inflammation is in the lungs
- Monitor how well asthma treatment is working
- Decide if you might need changes in your inhaler or medication
When your lungs are inflamed, certain cells produce more nitric oxide. So, a higher level in the breath usually means more airway inflammation.