What does a decreased FEno level suggest?

A decreased level of fractional exhaled nitric oxide (FEno) suggests decreased airway inflammation. This measurement is important in assessing inflammation in the airways, particularly in conditions like asthma, where airway inflammation is a primary concern.

Nitric oxide (NO) is a compound produced by the cells lining the airways, especially in response to inflammation. Higher levels of FEno are usually seen when there is increased airway inflammation, as is common in asthma or other allergic conditions. Conversely, when the FEno level is low, it indicates that there is less inflammation present in the airways, suggesting that the condition is under control or that there is less eosinophilic inflammation.

In essence, a decreased FEno level is indicative of a lower degree of inflammation, which is important for evaluating the management of respiratory conditions. Understanding this relationship helps clinicians tailor treatment approaches for patients based on their inflammatory status.