A spirometer measures how well your lungs work to help doctors diagnose asthma and other breathing problems. This test is as easy as blowing out your birthday candles. Watch this video to see what happens.

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Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2020 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.

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