My peak flow high is about 420. If I get to 370 I am in trouble. Peak flows tend to drop at night. so that is why they want you to do them first thing in the morning. But don't just depend on the peak flow. Watch your symptoms and if you have symptoms use that rescue inhaler and follow your attack plan. You can have symptoms without the peak flow dropping. In fact my asthma doc doesn't have me use it unless I have symptoms.
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Peak flow is also based on your normal functioning lung capacity so it's important to establish a 'normal' number when you're well, then you know when your short - I've always had low peak flow numbers, even when young, due to the lung damange from numerous pneumonia and bronchitis/asthma attacks. For me a 375-400 is decent. If I am down to 350 I need to make sure I'm doing the albuterol inhaler and flovent puffs, from 325 and under I need to be doing a neb and get into the Dr. I seem to have a small window of good vs bad, which is why knowing your numbers is good.
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Your peak flow is based on your height and age, and gender. This is an individual number, so you can't compare #'s. Look at the information sheet that came with your meter. This has what you need to set your meter correctly. Chart your peak flows over several days when you are not sick and this should be fairly consistent #. Hope this helps.
Edited by: BEATLEBEAR at: 3/19/2010 (17:50)
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