Interpreting the FeNO test results

The Fractional Exhaled Nitric Oxide (FeNO) greater than 40ppb suggests there is eosinophilic inflammation present in the airways, and will help support a diagnosis of Asthma in the right clinial context.

A FeNO less than 25ppb suggests there is no eosinophilic inflammation, although this does not exclude a diagnosis of asthma.

Mark as Understood

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