Peak expiratory flow readings are higher when patients are well, but lower when a patient's airway is constricted.
This term is used in medicine to refer to the maximum rate of a person's exhalation or to how fast and how long can they exhale.
This rate is measured by using the peak expiratory flow test that requires you to deeply inhale and then exhale as fast as hard as possible.
This rate is closely related to the amount of air flowing out of the lungs. This implies the peak expiratory flow is lower if there is a disease such as asthma that can constrict the airways.
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