Asthma - Peak Flow Diary

This leaflet is designed to be printed out for people to record their peak flow reading.

Peak flow diary for printing off

 To take a peak flow reading

  1. Put the marker to zero.
  2. Take a deep breath.
  3. Seal your lips around the mouthpiece.
  4. Blow as hard and as fast as you can into the device.
  5. Note the reading.
  6. Repeat three times.

The 'best of the three' is the reading to record on the chart.

Normal peak flow readings vary, depending on your age, size, and sex. The range of normal peak flow readings is published on a chart, and doctors and nurses refer to the chart when they check your peak flow reading. In healthy people, peak flow readings vary slightly from time to time. The reading is often slightly higher in the evening compared with the morning.

Below is an example of a two-week diary of peak flow readings done by a child who has quite bad asthma.

peak flow

Further help & information

Original Author:
Dr Tim Kenny
Current Version:
Peer Reviewer:
Prof Cathy Jackson
Document ID:
4684 (v40)
Last Checked:
11/11/2014
Next Review:
10/11/2017
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