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Keeping a Peak Flow Diary

Your peak flow rate is a way to see how well your lungs are working, based on how forcefully you can blow into the peak flow meter.1

A Peak Flow Diary helps you to keep track of your asthma, because your symptoms and peak flow readings will generally correlate.

It’s normal for your peak flow to vary a bit, from day to day and from morning to night, so it’s the overall pattern of your readings that’s important rather than the figures themselves.1

If you don’t have a peak flow meter or diary, but would like one, ask your doctor or nurse at your next asthma appointment.

Approval code: RESP-IE-NP-00089

Date of preparation: November 2020

  1. Peak Flow Diary. Asthma UK. Available at: Last accessed: November 2020.

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