Subjects will be screened, enrolled and tested at Study Visit #1 and then prescribed inhaled corticosteroid (ICS) treatment as per routine clinical care. Subjects will return for Study Visit #2 in two weeks and repeat fractional exhaled nitric oxide (FeNO) measured with the Vivatmo pro
This is a multi-center study to evaluate fractional exhaled nitric oxide (FeNO) measured with the Vivatmo pro in adult and pediatric subjects.