Successful Fractional Exhaled Nitric Oxide Measurements with NIOX VERO using 6- and 10-s Exhalation Modes in Children with Asthma Aged 4–10 Years: A Randomized Study

Introduction Fractional exhaled nitric oxide (FeNO) is a valuable tool for measuring allergic airway inflammation in children with asthma, particularly in those for whom other tests are difficult to perform. The use of a 6-s exhalation time (6-s mode) rather than 10 s (10-s mode) used for adults is in line with current recommendations, making FeNO a feasible option for younger children. However, s…