Identifying the predictive value of fractional exhaled nitric oxide (FeNO) for uncontrolled asthma in 3–7-year-old Thai children

This study established a significant correlation between FeNO levels and uncontrolled asthma, FeNO cutoff point ≥15 ppb as the optimal value in predicting uncontrolled asthma in Thai children aged 3-7 years. Factors such as uncontrolled allergic rhinitis, symptoms at onset, smoking exposure, treatment compliance, and inhaled corticosteroid (ICS) usage were associated with FeNO values. The application of FeNO measurement should be integrated with clinical assessments and consideration of these associated factors.