Spirometer Peak expiratory flow PEF

These patterns can help you prevent your symptoms from worsening before a full-blown asthma attack. The PEFR test can help you discover when you need to adjust your medication. Or it can help determine whether environmental factors or pollutants are affecting your breathing.
When does a doctor recommend a peak expiratory flow rate test?
The PEFR test is a common test that helps to diagnose and check lung problems, such as:
chronic obstructive pulmonary disease (COPD)
a transplanted lung that is not working properly
You may also perform this test at home. It will help to determine if lung disorder treatments are working to prevent symptoms from worsening.