FeNO Test

What is a FeNO Test?

A FeNO test, also known as an exhaled nitric oxide test, is utilised in individuals with allergic or eosinophilic asthma to gauge the level of lung inflammation and assess the effectiveness of inhaled steroids in managing it. Even if you perceive your breathing as normal with allergic or eosinophilic asthma, your exhaled nitric oxide levels could remain notably high. In such cases, adjusting your inhaled steroid dosage slightly upward may lead to better long-term control of inflammation.

What is Nitric Oxide?

Nitric oxide is a gas generated by cells participating in the inflammatory processes linked to allergic or eosinophilic asthma.

How is Nitric Oxide Measured?

The FeNO test employs a portable device to gauge the concentration of nitric oxide in parts per billion (PPB) within the air exhaled from your lungs at a slow pace. Unlike many lung function tests, the exhaled nitric oxide test necessitates a slow and steady exhalation rather than a forceful and rapid one to ensure precise measurements.

Why is Nitric Oxide Measured?

Your allergist might assess your exhaled nitric oxide levels to detect the characteristic inflammation linked to allergic or eosinophilic asthma during the diagnostic process. Subsequently, they may reevaluate these levels to ensure that the steroid inhalers you're prescribed are effectively suppressing nitric oxide levels.

Your consultant can utilise data obtained from FeNO testing, along with spirometry and other lung function assessments, to tailor and fine-tune your medication regimen, ensuring optimal control of your asthma.