If you have questions about how to use a peak flow meter or how to read the results, talk with your doctor. Ask your doctor to show you how to use this device before you use it at home. Read and follow the instructions included with the peak flow meter. A peak flow meter is an inexpensive handheld device you breathe into as hard and as fast as you can. PMID 13846051.To perform the peak expiratory flow (PEF) test, you need a peak flow meter. "Maximum forced expiratory flow rate as a measure of ventilatory capacity: with a description of a new portable instrument for measuring it". ^ WRIGHT BM, McKERROW CB (November 1959)."How can I determine a normal peak flow rate for me?". "British Guideline on the Management of Asthma - Annex 8: Personal Asthma Action Plan" (PDF). ^ Scottish Intercollegiate Guidelines Network The British Thoracic Society (July 2007).Wright values may be converted to the EU scale using the following formula: EU = 50.356 + 0.4 W + ( 8.814 × 10 − 4 × W 2 ) − ( 1.116 × 10 − 7 × W 3 ) : CS1 maint: DOI inactive as of January 2024 ( link) In 2004 the UK switched from the original Wright scale to the newer, more accurate European scale. NHANESIII reference values provided by the US Centers for Disease Control (CDC).There is a wide natural variation in results from healthy test subjects. Some examples of Reference Values are given below. There are a number of non-equivalent scales used in the interpretation of peak expiratory flow. More recently, medical calculators have been developed to calculate predicted values for peak expiratory flow. For this reason, tables or charts are used to determine the normal value for a particular individual. Various reference values have been published in the literature and vary by population, ethnic group, age, sex, height and weight of the patient. To interpret the significance of peak expiratory flow measurements, a comparison is made to reference (normal, predicted) values based on measurements taken from the general population. Scales or reference values Normal values, shown on EU scale. It is important to use the same peak flow meter every time. When peak flow is being monitored regularly, the results may be recorded on a peak flow chart. When monitoring is recommended, it is usually done in addition to reviewing asthma symptoms and frequency of reliever medication use. However, it can be useful in some circumstances.Ī small portion of people with asthma may benefit from regular peak flow monitoring. It is classically reduced in obstructive lung disorders such as asthma.ĭue to the wide range of 'normal' values and the high degree of variability, peak flow is not the recommended test to identify asthma. Measurement of PEFR requires training to correctly use a meter and the normal expected value depends on the patient's sex, age, and height. From changes in recorded values, patients and doctors may determine lung functionality, the severity of asthma symptoms, and treatment. Peak flow readings are higher when patients are well, and lower when the airways are constricted. Peak expiratory flow is typically measured in units of liters per minute (L/min).įunction Peak flow meter (made in USA) It measures the airflow through the bronchi and thus the degree of obstruction in the airways. The peak expiratory flow ( PEF), also called peak expiratory flow rate ( PEFR) and peak flow measurement, 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.
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