Peak Expiratory Flow Rate (PEFR) is a quick and simple bedside measurement. A small tube with a slider device measures how fast air is driven through the tube by the subject exhaling rapidly. The subject takes a deep breath in, then breathes out as hard and as fast as possible, with a good airtight seal of the lips around the tube. This is best done standing up; the best of three attempts is usually taken, with a short rest between attempts.
Peak Expiratory Flow Rate (PEFR) or Respiratory Function Tests (RFTs) may be requested by your doctor for symptoms such as shortness of breath (dyspnoea), cough or wheezing.
The normal range for Peak Flow measurements depends on your gender, age, and height. There is a reasonable ‘spread’ of normal values for any group of people with the same age, height and gender. The individual’s “personal best” measurement is a more reliable guide to predicting an asthma attack or assessing the severity of illness.
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