You will know whether you need to change your treatment.You can find out if your treatment is having the effect it should on your asthma.You will be able to tell what is going on in your airways rather than just guessing by the way you feel.Peak flow readings are measured in litres per minute and it is important that you get to know your best peak flow. The better controlled your asthma, the harder you will be able to blow out and the higher your peak flow score will be. The meter has a marker that slides up the scale as you blow out. In simple terms this means how hard and quickly you blow air out of your lungs. Your doctor should normally state the make and type on your prescription, but the manufacturer of the peak flow meter is not important because they all do the same thing, which is measure your expiratory flow rate.
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