I have been diagnosed with asthma within the past year. I was instructed to measure my peak flow three times, and record the best of the three readings. I have found that, at times, my first peak flow reading will be much higher than the second two. For example a first reading may be 650 and then the second 450-500. Is theis indicative of anything? Thank you
There are several possibilities. It is possible that you are unconsciously performing the first exhalation with greater effort than the subsequent ones, possible that your best effort results in minimal, transient airway obstruction or finally, that you are using improper technique with the first “blow” in a manner that falsely elevates the outcome. More likely than the preceding explanations is that the difference between 650 and 500 is not statistically significant, each value reflecting very good air flow.
Arrange to perform the peak flow measurements in the presence of your doctor or his/her nurse to watch so they can assess your technique.
Good luck. May your peak flows forever stay in this range.
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