It is higher in tall people than in short people(7). It is highest in early adult life, and decreases in old age. Normal females have a lower range between 300 and 500 L/min(4). In normal males the range of PEFR lies between 450 and 700 liters per minute (L/min.). In general, the taller or younger the individual, the higher is his PEFR Normal males have a higher PEFR than normal females of the same age and height. The normal value for a given person can be determined referring to a Nomo gram. PEFR depends on some factors the sex, age, weight, height, body-size, and muscular forces of the individual subject(4). PEFR is measured by the subject inhaling to total lung capacity and exhaling into a peak flow meter with maximal effort PEFR measured using peak flow meter(6). Normal person it is 400 Liter per minute(5). The simplicity of the method is its main advantage. The peak flow, which is sustained for only a fraction of a second, occurs in the earliest part of expiration(4). Peak expiratory flow rate is the maximal rate of air flow which is a subject can achieve by a forced expiration. At home asthma patient and others can monitor their respiratory function by blowing into a handled meter, measures peak expiratory flow rate (PEFR), the maximum speed at which they can exhale (2). Patients with severe airflow limitation may have a very prolonged forced expiratory time (3). The act of expiration triggers the moving record chart, which measures volume against time. The technique involves a maximum inspiration followed by a forced expiration (for as long as possible) into the spirometer (3). Both the FEV1 and FVC are related to height, age and sex. The spirometer measures the FEV1 and the forced vital capacity (FVC). Pulmonary function can be measured by having a subject breathe into a device called a spirometer which recapture the expired breath and records such variables as the rate and depth of breathing, speed of expiration, and rate of oxygen consumption (2). Measuring how efficient the lungs are in the process of gas exchange (1). Measuring how easily air flows into and out of the airways Simple respiratory function tests fall into three main groups: Finally, regular monitoring of lung function in chronic diseases such as idiopathic pulmonary fibrosis, cystic fibrosis or obstructive airways disease may warn of deterioration (1). Third, serial measurements over time will show changes indicating disease progression or, alternatively, a favorable response to treatment. Second, they will help indicate the severity of the condition. First, in conjunction with the clinical assessment and other investigations they may help establish a diagnosis (1). Measurements of respiratory function may provide valuable information. Lung function tests, What is PEFR and how can we measure it, Importance in PEFR value in lung diseases have been included in this analytical essay. In obstructive airways diseases, normal value of PEFR is reduced corresponding to above factors.Īs above factors, though PEFR value has some advantages, to diagnose obstructive airway diseases it can’t differentiate asthma from COPD. So the PEFR value varies with normal individuals and a Nomo gram is utilized as a scale. Normal PEFR value depends on several factors like age, sex, height, weight, etc. As a lung function test, it can be differentiated obstructive airway diseases such as asthma, COPD(chronic obstructive pulmonary diseases) from restrictive lung diseases. People can use it monitoring their lung function in respiratory diseases. It can be measured by peak flow meter which is a simple device. PEFR value means peak expiratory flow rate that is a persons maximum speed of expiration.
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