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Peak Flow (Lung Function Test)
To help work out a diagnosis of asthma your doctor needs to put the pieces of the jigsaw together.
One of the pieces needed is a lung function test.
There are a few tests we can do, including Peak Flow, FeNO and Spirometry.
What is a peak flow?
A peak flow is a simple test of how quickly you can blow air out of your lungs. It can show if your airways are narrowed or not.
Why is it carried out?
Peak flow readings can help with monitoring your asthma and can also be used to help diagnose asthma. Your score can show whether or not your asthma is getting worse or improving. Many people with asthma have their own peak flow meter at home which helps them to monitor their asthma.
What do I have to do in the test?
1. Set your peak flow meter to zero
2. Take a deep breath in
3. Put your teeth and lips tightly around the mouthpiece
4. Blow as hard and fast as you can into the mouthpiece
5. Do this 3 times
6. Record your best score
How long does it take?
It usually only takes 1 or 2 minutes, you might need a short rest between your blows.
Do I need to do anything before the test?
You don’t need to do anything to prepare for this test.