Health Concern On Your Mind?
See what your medical symptoms could mean, and learn about possible conditions.
Drugs & Supplements
Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.
Having trouble identifying your pills?
Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.
Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.
Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.
Read expert perspectives on popular health topics.
Connect with people like you, and get expert guidance on living a healthy life.
Got a health question? Get answers provided by leading organizations, doctors, and experts.
Sign up to receive WebMD's award-winning content delivered to your inbox.
Put the pointer on the gauge of the peak flow meter to 0 or the lowest number on the meter. In the photo, this is about 50.
Attach the mouthpiece to the peak flow meter. Some meters don't have a separate mouthpiece.
While standing, take a deep breath.
Put the peak flow meter mouthpiece in your mouth, and close your lips tightly around the outside of the mouthpiece. Don't put your tongue inside the mouthpiece.
Breathe out as hard and as fast as you can for 1 or 2 seconds. A hard and fast breath usually produces a "huff" sound.
Check the number on the gauge, and write it down. This is your peak expiratory flow (PEF). In the photo, the PEF is about 180.
ByHealthwise StaffPrimary Medical ReviewerJohn Pope, MD - PediatricsSpecialist Medical ReviewerLora J. Stewart, MD - Allergy and Immunology
Current as ofSeptember 9, 2014
WebMD Medical Reference from Healthwise
©2005-2015 WebMD, LLC. All rights reserved.
WebMD does not provide medical advice, diagnosis or treatment. See additional information.