It is a procedure in which air flowing out of the lungs is measured. The measurement obtained is called the peak expiratory flow rate (PEFR), or peak expiratory flow (PEF).Peak flow measurement may be obtained using a spirometer, an instrument with a mouth piece that measures the amount of air breathed in and/or out and the rate at which the air is inhaled and expelled from the lungs.
Due to the wide range of ‘normal' values and high degree of variability, peak flow is not the recommended test to identify asthma. However, it can be useful in some circumstances. A small portion of people with asthma may benefit from regular peak flow monitoring. From Wikipedia, the free encyclopedia. The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR) is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air. Peak expiratory flow rate (PEFR) is the maximum flow rate generated during a forceful exhalation, starting from full lung inflation. Peak flow rate primarily reflects large airway flow and depends on the voluntary effort and muscular strength of the patient.  Peak flow measurement is a procedure in which air flowing out of the lungs is measured. The measurement obtained is called the peak expiratory flow rate (PEFR), or peak expiratory flow (PEF). Peak flow measurement may be obtained using a spirometer, an instrument with a mouth piece that measures the amount of air breathed in and/or out and the rate at which the air is inhaled and expelled from the lungs. Peak flow may also be measured with a peak flow meter (PFM), a portable, hand-held device. Both devices take the measurement as an individual forcefully blows into the mouthpiece of the device. Spirometry is usually performed in a doctor’s office, clinic, or a hospital. A. A peak flow meter is an inexpensive, portable, handheld device for those with asthma that is used to measure how well air moves out of your lungs. Measuring your peak flow using this meter is an important part of managing your asthma symptoms and preventing an asthma attack. The peak flow meter works by measuring how fast air comes out of the lungs when you exhale forcefully after inhaling fully. Peak flow measurement using a peak flow meter is particularly useful for individuals with asthma. During an asthma flare-up, the large airways in the lungs slowly begin to narrow. This slows the speed of air leaving the lungs. Peak flow may also be measured with a peak flow meter (PFM), a portable, hand-held device. Both devices take the measurement as an individual forcefully blows into the mouthpiece of the device. Spirometry is usually performed in a doctor’s office, clinic, or a hospital. A peak flow meter is a portable, inexpensive, hand-held device used to measure how air flows from your lungs in one fast blast.. In other words, the meter measures your ability to push air out of your lungs. Peak flow meters com in two ranges to measure the air pushed out of your lungs. A low-range peak flow meter is for small children, and a standard-range peak flow meter is for older children, teenagers and adults. A normal peak flow rate is based on a person's age, height, sex and race. A standardized normal may be obtained from a chart comparing the person with asthma to a population without breathing problems. A patient can figure out what is normal for them, based on their own peak flow rate. How will the change affect me as a: Predictive Normal Values (Nomogram, EU scale). The change in scale for peak flow meters will result in PEF readings that are different, depending on whether the individual has used a Wright scale meter, or the new EU scale meter. Predictive Normal Values have been calculated for women and men of different ages and heights, and have been adapted (with agreement from the original Authors) for use with the new EU Scale / EN 23747 peak flow meters. The change in scale for peak flow meters will result in PEF readings that are different, depending on whether the individual has used a Wright scale meter, or the new EU scale meter.
https://en.wikipedia.org/wiki/Peak_expiratory_flow http://emedicine.medscape.com/article/1413347-overview http://www.hopkinsmedicine.org/healthlibrary/test_procedures/pulmonary/peak_flow_measurement_92,P07755/ http://www.webmd.com/asthma/guide/peak-flow-meter http://www.hopkinsmedicine.org/healthlibrary/test_procedures/pulmonary/peak_flow_measurement_92,P07755/ http://www.lung.org/lung-health-and-diseases/lung-disease-lookup/asthma/living-with-asthma/managing-asthma/measuring-your-peak-flow-rate.html http://www.peakflow.com/top_nav/normal_values/index.html http://www.peakflow.com/top_nav/normal_values/index.html
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