If you or your child has asthma, a peak flow meter can be a valuable tool for managing symptoms and preventing asthma attacks. This simple, portable device measures how well air moves out of your lungs, helping you identify changes in your breathing that may indicate worsening asthma.
A peak flow meter is a handheld device that measures your peak expiratory flow (PEF), which is the maximum speed at which you can exhale air from your lungs after taking a deep breath. By regularly monitoring your PEF, you can detect early signs of airway narrowing, even before you experience symptoms.
Using a peak flow meter as part of your asthma management plan can help you:
Recognize early warning signs of worsening asthma
Identify triggers that cause your asthma symptoms
Determine if your asthma action plan is working effectively
Make informed decisions about adjusting your asthma medications
Know when to seek emergency care for severe asthma attacks
Using a peak flow meter is simple and easy. Follow these steps:
Stand up or sit up straight
Ensure the indicator is at the bottom of the meter (zero)
Take a deep breath, filling your lungs completely
Place the mouthpiece in your mouth, lightly biting with your teeth and closing your lips around it
Keep your tongue away from the mouthpiece
Blast the air out as hard and fast as possible in a single blow
Remove the meter from your mouth and record the number that appears on the meter
Repeat steps 1-7 two more times and record the highest of the three readings in your asthma diary
To effectively use your peak flow meter, you need to establish your "personal best" PEF. This is the highest reading you can achieve when your asthma is well-controlled. Take readings twice a day for 2-3 weeks when you are feeling good and have no asthma symptoms. Your personal best PEF will serve as a baseline for comparing future readings and developing your asthma action plan.
Once you have determined your personal best PEF, take daily readings at the same time each morning. If your PEF drops below 80% of your personal best, follow your asthma action plan and check your PEF more frequently that day. Seek immediate help if your asthma symptoms worsen.
Remember, while a peak flow meter is an essential tool for managing asthma, it is not a substitute for recognizing your symptoms and early warning signs. Always work closely with your asthma care provider to develop a comprehensive asthma management plan that works for you.
For more information on using a peak flow meter and managing your asthma, visit the Centers for Disease Control and Prevention website.
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