This a simple investigation of how well the lungs are working which is a routine part of lung function tests. PEF can easily be performed at the bedside or at the GP’s office. You will need to take a deep breath, then blow out as hard and fast as you can into a small tube (peak flow meter). This measures the flow of air and can be used to identify obstruction of the airways. PEF is often used to monitor a range of respiratory diseases such as asthma.
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