When it comes to asthma monitoring, the eye is the key; according to one professor, who has spent years researching and refining a new peak expiratory flow chart.

When it comes to asthma monitoring, the eye is the key; according to Associate Professor Helen Reddel, who has spent years researching and refining a new peak expiratory flow chart.

Green zone refers to 80-100% of normal peak flow and usually indicates good control of asthma. Yellow zone refers to 50-80% of normal peak flow and cautions that asthma is getting worse.

How to use a peak flow meter: The best time to take your peak flow levels is in the morning before you take your asthma medications. But if you are having more lung trouble than usual, you may ...

SAN FRANCISCO — Physicians can use peak expiratory flow as a first-line tool for assessing variable airflow limitations among patients with asthma, according to a poster presented at the ...