Fractional exhaled nitric oxide (FeNO) is a direct marker of Type 2 (T2)-driven inflammation in the airways and aids in the diagnosis of asthma.1, 2 FeNO is reproducible and easy to use in the clinic setting.3 - 5 FeNO measurement technique is often easier for younger children to master than spirometry6 and much less invasive than sputum induction or bronchoscopy.7, 8
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