Guide to Peak Expiratory Flow Measurement | Asthma Management Tool

Peak expiratory flow measurement is a simple, non-invasive test that assesses the maximum speed of air expelled during forced exhalation, often used in asthma management and monitoring.
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Prepared by Lee Cheng, reviewed by Dr. Helena Rodriguez

Peak Expiratory Flow Measurement FAQ


Image credit: healthline.com

What is a peak expiratory flow measurement?

The measurement is also called the peak expiratory flow rate (PEFR) or the peak expiratory flow (PEF). Peak flow measurement is mostly done by people who have asthma. Peak flow measurement can show the amount and rate of air that can be forcefully breathed out of the lungs. The measurement should be started after a full lung inhalation.

What is peak flow measurement?

Peak flow measurement is a quick test to measure air flowing out of the lungs. The measurement is also called the peak expiratory flow rate (PEFR) or the peak expiratory flow (PEF). Peak flow measurement is mostly done by people who have asthma.

What is a peak expiratory flow rate (PEFR) test?

The peak expiratory flow rate (PEFR) test measures how fast a person can exhale. The PEFR test is also called peak flow. This test is commonly performed at home with a handheld device called a peak flow monitor. For the PEFR test to be useful, you must keep continuous records of your flow rate.

What are peak expiratory flow and spirometry?

This article explains how they are done Peak expiratory flow (PEF) and spirometry are the two most commonly used lung function tests in the diagnosis and monitoring of respiratory conditions. Both tests measure the speed and efficiency with which air moves in and out of the lungs.

Peak Expiratory Flow Measurement References

If you want to know more about Peak Expiratory Flow Measurement, consider exploring links below:

What Is Peak Expiratory Flow Measurement

  1. https://www.nhs.uk/conditions/peak-flow-test/
  2. https://www.ncbi.nlm.nih.gov/books/NBK459325/
  3. https://www.asthmaandlung.org.uk/symptoms-tests-treatments/tests/peak-flow
  4. https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/peak-flow-measurement
  5. https://geekymedics.com/peak-expiratory-flow-rate-pefr/
  6. https://en.wikipedia.org/wiki/Peak_expiratory_flow
  7. https://www.healthline.com/health/peak-expiratory-flow-rate
  8. https://www.bmj.com/content/353/sbmj.h6159
  9. https://emedicine.medscape.com/article/1413347-overview
  10. https://www.uhhospitals.org/health-information/health-and-wellness-library/article/tests-and-procedures/peak-flow-measurement

Peak Expiratory Flow Measurement Information

  1. https://www.pcrs-uk.org/sites/default/files/resource/Consensus%20calculate%20%26%20interpret%20PEF%20PRF2%20250324.pdf
  2. https://www.transformationpartners.nhs.uk/wp-content/uploads/2019/01/Healthy-London-Partnership-peak-flow-measurement-guidance-2018.pdf

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