What is the significance of measuring peak expiratory flow rate (PEFR)?

Measuring peak expiratory flow rate (PEFR) is significant primarily because it helps assess the severity of asthma. This measurement reflects how quickly a person can exhale, which is essential for understanding airflow limitation in the airways. In asthma, the airways can become constricted or obstructed, leading to difficulty in breathing. By regularly measuring PEFR, individuals can determine how well their asthma is controlled and recognize early signs of an impending asthma attack. It provides valuable information on the effectiveness of medication and can guide treatment decisions.

While PEFR is not used to assess lung cancer risk, monitor heart function, or determine blood oxygen levels, its role in managing asthma makes it a critical tool for those experiencing respiratory issues. Understanding how a patient's airflow varies can help in creating effective management strategies and adjusting treatment as needed.