This study uses the fenoTRACK device to monitor changes in FeNO levels in people with asthma. FeNO stands for Fractional Exhaled Nitric Oxide, a gas in your breath that helps doctors understand how well your asthma is controlled.

The study has two parts: one for people whose asthma is not well-controlled and another for those whose asthma is controlled. If your asthma is not controlled, you may receive corticosteroid therapy for two weeks. This is a type of medicine that helps reduce inflammation in the lungs. The study wants to see if this medicine helps lower FeNO levels and improve asthma symptoms.

For those with controlled asthma, the study checks how precise the fenoTRACK device is when used at home compared to a doctor's office. Participants will use the device at home and during two visits to the doctor.

• The study lasts about 2 weeks for uncontrolled asthma participants.
• Participants must be 5 years or older and able to follow study instructions.
• People with other serious lung diseases or who smoke may not join.

If interested, talk to your doctor to see if you qualify!