when you've finished breathing out, make a note of your reading.breathe out as quickly and as hard as you can.breathe in as deeply as you can and place your lips tightly around the mouthpiece.hold the peak flow meter so it's horizontal and make sure that your fingers are not obstructing the measurement scale.push the pointer back to the first line of the scale nearest the mouthpiece.find a comfortable position, either sitting or standing – do this the same way every time.After this they may advise you to carry out the test regularly at home using your own peak flow meter. The first time your peak flow is measured, you'll be taught how to do it by a doctor or nurse. Measuring your peak flow before and after exposure to a possible asthma trigger, such as something you're allergic to or a substance you're exposed to at work, may also show if anything in particular causes your symptoms. It can also check if your medication is working, and indicate whether you're having an asthma attack. Your score can show whether or not your condition is getting worse. If you've already been diagnosed with asthma, measuring your peak flow regularly can be a useful way of monitoring your condition. This could be a sign that you have asthma, although other tests such as spirometry will often be needed to confirm the diagnosis. Why peak flow is measuredīy measuring how fast you're able to breathe out, your peak flow score can indicate whether your airways are narrowed. These are available on prescription or can be bought from most pharmacies. A peak flow test involves blowing as hard as you can into a small handheld device called a peak flow meter.
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