What is peak expiratory flow rate?

Peak expiratory flow rate (PEFR) or ‘peak flow’  is a simple bedside test of lung function, most commonly used in people with asthma or chronic obstructive airways disease (COAD).

How is a PEFR test performed?

A PEFR test is a quick and simple bedside measurement. A small tube with a slider device measures how fast air is driven through the tube by the subject exhaling rapidly.

The subject takes a deep breath in, then breathes out as hard and as fast as possible, with a good airtight seal of the lips around the tube.

This is best done standing up; the best of three attempts is usually taken, with a short rest between attempts.

When would you need a PEFR test?

A PEFR may be requested by your doctor for symptoms such as shortness of breath (dyspnoea), cough or wheezing.

Book your health appointments online

Find and instantly book your next health appointment with Healthengine

Find health practitioners

PEFR test results explained

The normal range for peak fow measurements depends on your gender, age, and height.

There is a reasonable ‘spread’ of normal values for any group of people with the same age, height and gender.

The individual’s “personal best” measurement is a more reliable guide to predicting an asthma attack or assessing the severity of illness.

Related specialists

Related tests

Also known as

  • Peak flow
  • PEFR

Links

 

A: Use HealthEngine to find and book your next GP appointment. Click on the following locations to find a GP clinic in your state or territory.

 

This article is for informational purposes only and should not be taken as medical advice. If in doubt, HealthEngine recommends consulting with a registered health practitioner.

All content and media on the HealthEngine Blog is created and published online for informational purposes only. It is not intended to be a substitute for professional medical advice and should not be relied on as health or personal advice. Always seek the guidance of your doctor or other qualified health professional with any questions you may have regarding your health or a medical condition. Never disregard the advice of a medical professional, or delay in seeking it because of something you have read on this Website. If you think you may have a medical emergency, call your doctor, go to the nearest hospital emergency department, or call the emergency services immediately.