SPIROMETRY FAILS THIS DIAGNOSIS. IOS DOES NOT.

Asthma patients may be asymptomatic and still show levels of increased airways resistance. In this example, IOS shows elevated resistance in both 5 Hz and 20 Hz indicating some central obstruction that clearly responds to a bronchodilator. Spirometry is normal and no significant changes with bronchodilator. Clearly IOS is the better! Click on the report below and it will expand.