![]() Weather, exposure to allergens, infection, or even exercise can all affect asthma symptoms. The PEFR often changes in response to a flare-up of asthma. If you measure your peak flow regularly, you should always do that at the same time of the day, as PEFR changes throughout the day.People with asthma may develop narrowing of the airways, which lowers the amount of air they can exhale. Normal peak flow variability shouldn't exceed 20%. If needed, the peak flow calculator can also count the diurnal variability for you (hit the advanced mode button). ![]() You can now compare it to the average, standardized value, or your personal best in our peak flow calculator, to see in which zone you are in.
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