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A peak flow meter is a portable, easy-to-use device that measures how well your lungs are working. If you have asthma, your doctor may recommend that you use a peak flow meter to help track your asthma control.

In addition to watching for worsening signs and symptoms, such as wheezing or coughing, you can use a peak flow meter to help you decide when you need to act to keep your asthma under control. Regular use of your peak flow meter can give you time to adjust your medication or take other steps before your symptoms get worse. A peak flow meter can be useful for adults and children as young as preschool age.

Spirometry (spy-ROM-uh-tree) is a common office test used to assess how well your lungs work by measuring how much air you inhale, how much you exhale and how quickly you exhale.

Spirometry is used to diagnose asthma, chronic obstructive pulmonary disease (COPD) and other conditions that affect breathing. Spirometry may also be used periodically to check whether a treatment for a chronic lung condition is helping you breathe better.

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