Peak flow - what is it and how is it measured?

Dr Louisa Draper

"Your peak flow score can be an indicator of whether your airways have narrowed, which is a sign that you might have asthma."

Dr Louisa Draper

View Asthma Inhalers
A peak flow test (also called a peak expiratory flow test or PEF test) is a lung function test that measures how fast you can breathe out.  The measurement that’s taken is called your peak flow. A peak flow meter can be used to monitor your asthma and some other lung conditions.