Keep up-to-date with FeNO
Join our mailing list today:

Asthma Awareness Month Part 4: Doing a FeNO test


As Asthma and Allergy Awareness Month in the USA comes to an end, this is the final part to our four-part series, we hope you have found it informative and that you feel empowered to manage your asthma. We have explained what FeNO is and how it can help you, but we wanted to finish off this series with how to do a FeNO test...

Part four: How to do a FeNO test

Doing a FeNO test is as easy as inhaling and exhaling.

You inhale and exhale through the device, guided by the engaging animations on the screen. You exhale at about the same pressure as blowing bubbles in a drink through a straw. The exhalation lasts for 10 seconds for adults and 6 seconds for children, and can even be performed by those with severely reduced lung function, making it accessible for all.1-3

The test only lasts about 2 minutes from inhalation to receiving your result.

It is important to note that you should avoid eating, drinking, smoking, or strenuous exercise for around two hours before your test as these factors may influence your FeNO score which could affect treatment decisions.4

If this series has made you interested in managing your asthma with FeNO, speak to your doctor. Download our handy guide on how to perform a FeNO test so you can feel confident doing it in the clinic.

We hope that the information we have shared in this series encourages you to take control of your asthma. Asthma Awareness Month may only last one month, but it is important year-round. At FeNOandAsthma.com, we are here to give you educational articles year-round to continue to learn about your asthma.

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.

Related Articles

Tell your doctor about FeNO

Simply mention FeNO at your
next appointment

Download PDF to take
to your next appointment

Supporting evidence:

1. 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.
2. Crater G et al. Successful fractional exhaled nitric oxide measurements with NIOX VERO using 6-and 10-s exhalation modes in children with asthma aged 4–10 years: a randomized study. Pulm Ther. 2017;3:139-48.
3. Donohue JF et al. Characterization of airway inflammation in patients with COPD using fractional exhaled nitric oxide levels: a pilot study. International journal of chronic obstructive pulmonary disease. 2014:745-51.
4. American Thoracic Society; European Respiratory Society. ATS/ERS recommendations for standardized procedures for the online and offline measurement of exhaled lower respiratory nitric oxide and nasal nitric oxide, 2005. Am J Respir Crit Care Med. 2005;171(8):912-30.