What is the diagnostic signifigance of a peak flow meter and what are normal ranges for an average 25 year old. I occasionally fell like i cant get good air in, no wheezing or asthma type symptoms, just an awareness of labored inspiration. It last somtimes an hour or two, somtimes most of the day im at least aware of it, and sometimes i wont notcie for a week or more. I have no respiratory problems persay, just get that feeling of breathing through a straw at times, though when this happened recently adn i had been aware of it, i tried the peak flow meter, and the readings were consistently over 525. I have other people who are having no difficulty try the meter and they usually dont even get that high, so would this assume that im not really short of breath, and am getting plenty of air, and the symptoms are only perceived, possibly chronic stress? If there were truly a problem would this not be lower. Also, recently seen outpatient, and one of the things they did was the pulse oximetry(on the finger)and these symptoms were occuring, however the o2 levels were perfectly normal. Again, would this not signify possibly something other than respiratory problem?