FeNO Testing

Fractional Ejection of Nitric Oxide (FeNO) Testing

FeNO testing is a non-invasive test that measures the amount of nitric oxide gas in a person's breath. Nitric oxide is a gas produced by cells in the lining of airways and is an important marker of airway inflammation.

What does a FeNO test diagnose?

This test is useful for diagnosing asthma when spirometry test results are unclear or display a borderline diagnosis. FeNO testing can also detect inflammation in lower airways, including in the bronchioles, and monitor treatment progression.

How is a FeNO test performed?

During this lung assessment, the patient exhales into a device that measures the concentration of nitric oxide in their breath. The test takes only a few minutes to perform and is simple and painless. When the test results are analysed, elevated nitric oxide levels indicate asthma presence. The results may also be used to distinguish between different types of airway inflammation, as elevated FeNO levels are associated with conditions including allergic rhinitis, COPD, and cystic fibrosis.

Do I need a FeNO test?

GPs may refer a patient for FeNO testing if their spirometry results came back unclear, they are experiencing respiratory condition symptoms, or they have recently commenced a new treatment plan.

The FeNO lung function test checks for inflammation of the lung, and how the inhaled steroids are suppressing the inflammation.

For more information about pulmonary function tests, speak to the sleep and thoracic specialists at NBST.

We are happy to assist with the diagnosis and treatment of lung conditions, breathing symptoms, and respiratory conditions.

Our doctors are on hand to assist with respiratory and sleep testing, diagnosis and treatment.

Contact us to book an appointment

Visit us at either our Clayfield or North Lakes location and experience compassionate care in a comfortable environment, tailored to meet your unique needs.