This leaflet is designed to be printed out for people to record their peak flow reading.
This leaflet is part of our series on Asthma
To take a peak flow reading
- Put the marker to zero.
- Take a deep breath.
- Seal your lips around the mouthpiece.
- Blow as hard and as fast as you can into the device.
- Note the reading.
- Repeat three times.
The 'best of the three' is the reading to record on the chart.
What are normal and abnormal peak flow readings?
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.
Further help & information
Further reading & references
- British guideline on the management of asthma; Scottish Intercollegiate Guidelines Network - SIGN (Oct 2014)
- Asthma; NICE CKS, Dec 2013 (UK access only)
- Global Initiative for Asthma (GINA)
Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. EMIS has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.
Dr Tim Kenny
Dr Colin Tidy
Prof Cathy Jackson