Peak expiratory flow rate?

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Answer :

DefinitionThe peak expiratory flow rate measures how fast a person can breathe out (exhale) air. It is one of many tests that measures how well the lungs are working.Alternative NamesPeak flowHow the test is performedThis test requires a peak expiratory flow monitor: a small handheld device with a mouthpiece at one end and a scale with a moveable indicator (usually a small plastic arrow).To perform this test:Breathe in as deeply as possible.Blow into the instrument's mouthpiece as hard and fast as possible.Do this three times, and record the highest flow rate.How to prepare for the testLoosen any tight clothing that might restrict your breathing. Sit up straight or stand while performing the tests.How the test will feelThere is usually no discomfort. Rarely, repeated efforts may cause some

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