Peak Flow Meters

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About Peak Flow Meters

A peak flow meter measures how fast you can blow air out of your lungs. The number it gives is a simple way of tracking whether your breathing is where it usually sits, better than usual, or heading the wrong way.

Its real value is in spotting a change before you feel it. Peak flow often starts dropping before symptoms become obvious, which gives you warning.

Meters in the range carry coloured zone markers that can be set to your own personal best. Green means your usual range, amber means take notice, red means act. Those zones are set to work alongside a written asthma action plan agreed with your doctor, so the reading leads to a decision rather than just a number.