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Five reasons to ask for FeNO testing


FeNO testing is a simple way to help diagnose and manage your asthma.1,2 Knowing your FeNO level can help you and your healthcare team recognise when your symptoms mean you could have asthma. If you have asthma, regular FeNO testing can also help show you whether your treatment is working or if it might need to be adjusted3 and it takes just a few minutes.

Here are five top reasons to ask your healthcare team for a FeNO test:

  1. A FeNO test can be performed during your appointment with your nurse or doctor.
  2. Completing the test only takes a couple of minutes.
  3. Taking a FeNO test is simple4 and feels just like blowing bubbles through a straw in a drink.
  4. Your results will be displayed on the FeNO machine after about a minute.
  5. FeNO results help your healthcare team understand more about your symptoms so they can take immediate action if they need to.

Ready for FeNO?

Download all the information you need to share the power of FeNO testing with your family, friends and healthcare team.

What is FeNO?

Download this for more information about FeNO testing.

Information for Doctors

Download and take this leaflet to your doctor / healthcare professional.

Taking a test

Download our handy guide on how to perform a FeNO test.

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Tell your doctor about FeNO

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Supporting evidence:

1.Khatri SB et al. Use of fractional exhaled nitric oxide to guide the treatment of asthma: an official American Thoracic Society clinical practice guideline. American Journal of Respiratory and Critical Care Medicine. 2021;204(10):e97-109.
2.Louis R et al. European Respiratory Society Guidelines for the diagnosis of asthma in adults. Eur Respir J. 2022; in press.
3.LaForce C et al. Impact of exhaled nitric oxide measurements on treatment decisions in an asthma specialty clinic. Annals of Allergy, Asthma & Immunology. 2014;113(6):619-23.
4.Alving K et al. Validation of a new portable exhaled nitric oxide analyzer, NIOX VERO®: randomized studies in asthma. Pulm Ther. 2017;3:207-218.