How to use your peak flow meter

Keeping a regular diary of your peak flow results is a good way to monitor your asthma. Peak flow is a simple measurement of how quickly you can blow air out of your lungs. It's often used to help diagnose and monitor asthma.

By measuring how fast you're able to breathe out, your peak flow score can indicate whether your airways are narrowed.

This could be a sign that you have asthma, although other tests such as spirometry will often be needed to confirm the diagnosis.

If you've already been diagnosed with asthma, measuring your peak flow regularly can be a useful way of monitoring your condition.

Your score can show whether or not your condition is getting worse. It can also check if your medication is working, and indicate whether you're having an asthma attack.

Please see the link below to download a printable table to help you record your results or use a mobile app.

The graph below demonstrates the normal values to expect based on your age, gender & height.

Peak flow results

Local Services, Let
Local Services, Let