The peak expiratory flow rate (PEFR) test measures how fast a person can exhale. The PEFR test is also called peak flow. This test is commonly performed at home with a handheld device called a peak flow monitor. Peak flow readings are higher when patients are well, and lower when the airways are constricted. From changes in recorded values, patients and doctors may determine lung functionality, the severity of asthma symptoms, and treatment. Due to the wide range of ‘normal’ values and the high degree of variability, peak flow is not the recommended test to identify asthma. However, it can be useful in some circumstances.
A peak flow meter is an inexpensive, portable, handheld device for those with asthma that is used to measure how well air moves out of your lungs. … This measure is called a “peak expiratory flow,” or “PEF.” Keeping track of your PEF, is one way you can know if your symptoms of asthma are in control or worsening.
