Peak flow meters are very helpful if you or your child have moderate to severe asthma and require daily asthma medications. Even most children ages 6 and up should be able to use a peak flow meter ...

Record asthma symptoms and peak expiratory flow (PEF) readings Compare PEF readings ... Your doctor will also use this diary to evaluate how well your asthma action plan is working.

Patients with severe asthma may still have positive bronchodilator response tests. Peak expiratory flow is inexpensive and simple to measure. SAN FRANCISCO — Physicians can use peak expiratory ...