You can explain to Ethan's parents that a peak flow meter is an important tool used to check if Ethan can effectively breathe air out of his lungs. It is also a great way to avoid Ethan's possible asthma attacks. Moreover, you also need to tell them that keeping a record of Ethan's peak expiratory flow or PEF will help the doctor assess if his condition is improving or not.
It will help the docters know the best way to help Ethan and provide the best course of treatment.
