What does peak flow indicate?
Your peak flow score can be an indicator of whether your airways have narrowed, which is a sign that you might have asthma. If your doctor suspects that you have asthma, there are more tests that can confirm the diagnosis, like spirometry.
Your peak flow score can also give you an idea of whether your condition is getting worse or improving.
It can also help your doctor or asthma nurse find out whether your medication is working and confirm whether you’re having an asthma attack.
If you suspect that something acting as an asthma trigger, you can measure your peak flow before and after you’ve been exposed to it to identify whether it could be a possible cause of your asthma symptoms.
Your peak flow scores will vary depending on a range of factors, including your age, height and if you’re male or female. Regular tests will help you keep track of your own individual lung function.
Your reading can also change depending on the time of day, so you’ll need to look for an overall pattern rather than one score taken in isolation. Most people know what their best peak flow score is and can keep an eye on when it goes up and down.