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Children's Asthma Peak Flow Calculator

This calculator is for children with asthma. If you know how tall your child is, you can find out what his or her personal best peak flow value is. Peak flow is how fast your child breathes out air after taking a deep breath. Your child's peak flow tells you and your child's doctor how well your child's lungs are working.

You need to know your child's personal best peak flow number to help control your child's asthma. This number is part of your child’s Asthma Action Plan.

Changes from your child's personal best can help you see how well your child's asthma is under control. These changes also can let you know when your child needs medicine and when your child needs medical care.

If you don't know how to find your child's personal best peak flow, click here for an explanation.

Note: The calculator will only work if your child is at least 43 inches tall.

Enter your child's information

This calculator is not intended to replace the evaluation of a healthcare professional.

Online Medical Reviewer: Pederson, Deborah, MD
Online Medical Reviewer: Pierce-Smith, Daphne, RN, MSN, CCRC
Date Last Reviewed: 2/1/2019
© 2000-2019 The StayWell Company, LLC. 800 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
 
 
 
 

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