Contents
What is a concerning peak flow?
Peak flow is a simple measurement of how quickly you can blow air out of your lungs. It’s often used to help diagnose and monitor asthma. Credit: A peak flow test involves blowing as hard as you can into a small handheld device called a peak flow meter.
When is peak flow too low?
If your airways are tight and inflamed, your peak flow score will be lower than normal. This could be a sign your asthma is getting worse. See your GP if: you’re having symptoms, or need to use your reliever inhaler three or more times a week, even if your peak flow scores are normal.
What is a good peak flow reading for adults?
Normal adult peak flow scores range between around 400 and 700 litres per minute, although scores in older women can be lower and still be normal. The most important thing is whether your score is normal for you.
What are the normal readings of peak flow meters?
Normal readings of peak flow meters are within 80-100% of the baseline reading. These readings are categorized in the green peak flow zone, which indicates stable lung function. When the readings are between 50 and 80% of the baseline reading, they are categorized in the yellow peak flow zone. This zone indicates a worsening in lung function.
How does a peak flow meter work for asthma?
A peak flow meter measures how fast air comes out of your lungs when you exhale forcefully. Readings from the meter can help you or your child recognize early signs of worsening asthma.
How often should you do the peak flow test?
This should be repeated 3 times, and the highest of the 3 measurements should be recorded as your peak flow score. If you’re monitoring your asthma at home, you may have a diary or chart to record your score. You can download a peak flow diary (PDF, 2.2Mb) from the Asthma UK website if you don’t have one.
Do you monitor your peak flow at home?
You may also be asked to monitor your own peak flow at home regularly, as part of your asthma action plan. These results are kept in a peak flow diary (Asthma UK) to see if your peak flow varies. This can be a feature of asthma, especially if it is not under control.