A peak flow meter is a portable handheld device used to measure how well a person with asthma can blow air out of the lungs. (Asthma narrows the airways, making breathing difficult.) The person blows ...

Peak flow meters help people with asthma know how well their lungs are working. A peak flow meter can tell if someone's airways have narrowed even before the person coughs, wheezes, or has trouble ...

BACKGROUND: The variability of peak expiratory flow (PEF) is now commonly used in the diagnosis and management of asthma. It is essential for PEF meters to have a linear response in order to obtain an ...