What does PEF stand for and what is it used to monitor?

Peak Expiratory Flow (PEF) refers to the measurement of the maximum speed of expiration, specifically how fast a person can blow air out of their lungs. It is a critical tool in monitoring airway obstruction, especially in individuals with asthma or other respiratory conditions. By measuring PEF, healthcare professionals can evaluate the severity of airway constriction, track changes in lung function over time, and make informed decisions about treatment adjustments.

Monitoring PEF can provide important information about how well a person's asthma or other respiratory condition is being controlled. A decrease in PEF readings can indicate worsening airway obstruction, prompting further evaluation or intervention. This focus on the airflow speed during exhalation directly relates to the assessment of airway status, making PEF a valuable parameter in the management of respiratory diseases.

Other options may suggest alternatives, but they either mischaracterize the term or focus on unrelated physiological aspects, thus not aligning with the primary purpose of PEF.