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A peak flow meter is a portable, easy-to-use device that measures how well your lungs are able to expel air. By blowing hard through a mouthpiece on one end, the peak flow meter can measure the force of air in liters per minute and give you a reading on a built-in numbered scale. If you have asthma, your doctor may recommend that you use a peak flow meter to help track your asthma control.
Regular use of a peak flow meter can help keep tabs on your asthma by detecting airway narrowing even before you feel any symptoms, giving 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 5.
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