How To: Use a peak flow meter to monitor asthma

How to Use a peak flow meter to monitor asthma

A peak flow meter is a simple, hand-held device that measures how efficiently you can move air out of your lungs. Peak flow readings can warn you of an impending asthma attack hours — or even days — before you experience any signs or symptoms. With time on your side, you can adjust your asthma medication and take other steps to help prevent an attack.