Flow Meter

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June 21st, 2007 admin Leave a comment Go to comments

Flow Meter

How accurate is a Microlife peak flow meter in measuring FEV1?

Has anyone actually used a microlife peak flow meter AND a real medical spirometer to measure FEV1? I ask because I've found that by inhaling as deeply as possible before exhaling, I increase my FEV1 value by as much as 15%. And by taking measurements while sitting rather than standing the FEV1 decreases by as much as 20%.
What I'm curious about is whether the FEV1 on the microlife accurately represents the measurements found on a real spirometer.

Positional differences result from your belly pushing up on your diaphragm inpeding the amount of air you can take in.
Are there no instructions that came with it? Because you are always supposed to take in as deep a breath as you possibly take before blowing into the device.
As to the accuracy, it is generally accurate. But accuracy is not really what you're looking for. It's a number of readings over a period of time that give you the best information. Also if a reading drops dramatically you know it's time to seek help. Make sure you keep a record of the readings so your doctor can see it.

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