Some people use peak flow meters to monitor changes in asthma. Peak flow readings show how well a child's lungs are working. This calculator shows the predicted peak flow in children. With your child's height, you can find his or her predicted peak flow. Predicted peak flow is how much air a child of a certain height is expected to breathe out (exhale) after taking a deep breath.
An even more important number is your child's personal best peak flow. This number helps monitor your child's asthma. Changes from your child's personal best help you see how well your child's asthma is controlled. These changes also can let you know when your child needs medicine and when your child needs medical care.
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Note: The minimum height for this calculator is 44 inches.
Here's how to find out your child's personal best peak flow:
Once you know your child's personal best peak flow, you and your child can work with his or her health care provider to figure out the peak flow ranges for each of the asthma action plan zones.
If you don't have an asthma action plan for your child or if his or her plan is not up to date, make sure you talk with your child's provider.
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Because your child's height is , his or her predicted peak flow is .
Asthma action plans are divided into zones. Each zone gives symptoms and peak flow ranges and what actions to take.
This calculator is not intended to replace the evaluation of a health care professional.