Peak Expiratory Flow Rate (PEFR) refers to a measure of how forcefully an individual is able to exhale air from their lungs during a maximal expiration. It is typically measured in liters per minute (L/min). PEFR is an essential tool in assessing and monitoring lung function in both healthy individuals and those with respiratory conditions, such as asthma.
PEFR is determined by using a peak flow meter, a handheld device with a scale and marker that measures the flow of air during a forceful exhalation. The individual takes a deep breath, seals their lips around the mouthpiece of the device, and blows out as hard and as fast as possible. The highest value recorded on the device represents the PEFR.
PEFR values can vary depending on an individual's age, sex, height, and size of their airways. In healthy individuals, PEFR tends to be higher in larger individuals and stronger in males compared to females. Moreover, PEFR can be affected by various factors such as time of day, physical activity, emotional state, and respiratory conditions.
PEFR is commonly used to monitor asthma symptoms and manage treatment plans. By measuring PEFR regularly, individuals with asthma can identify exacerbations or worsening of symptoms, adjust their medications, and manage their condition more effectively. In addition, PEFR can be used to determine the severity of an asthma attack, assess the effectiveness of bronchodilator medications, and monitor lung function over time.
