Asthma Inhalers and a Peak Flow Meter on a Medical Clipboard Stock Photo - Image of asthma, healthy: 102304610
Peak expiratory flow - Wikipedia
Dr Batra's - A patient diagnosed with Asthma approached us with a PFR of 250 which required immediate action. This graph represents her progress after treatment with Dr Batra's that improved her
Patient education: How to use a peak flow meter (Beyond the Basics) - UpToDate