Peak Flow Meter Say: PEEK FLO MEE-tur If you have asthma, your doctor might ask you to use a peak flow meter to check how well your lungs are working. To use it, a person blows into it and then checks the reading to see if the airways have narrowed. It's portable, it doesn't need to be plugged in, and it can be used at home. Back to Articles Related Articles Asthma Center Asthma means breathing problems. Find out what's going on in the lungs and how to stay healthy, if you have it. Read More Dealing With Asthma Triggers If you have asthma, certain things may cause you to cough and have trouble breathing. Find out more about asthma triggers in this article for kids. Read More Handling an Asthma Flare-Up How can you prepare for an asthma flare-up? Find out in this article for kids. Read More How Do Asthma Medicines Work? Kids who have asthma need to take medicine. But what kind of medicine do they take and what does it do? Let's find out. Read More Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.