FVC—Forced vital capacity; the total volume of air that can be exhaled during a maximal forced expiration effort.
FEV1—Forced expiratory volume in one second; the volume of air exhaled in the first second under force after a maximal inhalation.
FEV1/ FVC ratio—The percentage of the FVC expired in one second.
FEV6 —Forced expiratory volume in six seconds.
FEF25–75%—Forced expiratory flow over the middle one half of the FVC; the average flow from the point at which 25 percent of the FVC has been exhaled to the point at which 75 percent of the FVC has been exhaled.
MVV—Maximal voluntary ventilation.
ERV—Expiratory reserve volume; the maximal volume of air exhaled from end-expiration.
IRV—Inspiratory reserve volume; the maximal volume of air inhaled from end-inspiration.
RV—Residual volume; the volume of air remaining in the lungs after a maximal exhalation.
VT —Tidal volume; the volume of air inhaled or exhaled during each respiratory cycle.
FRC—Functional residual capacity; the volume of air in the lungs at resting end-expiration.
IC—Inspiratory capacity; the maximal volume of air that can be inhaled from the resting expiratory level.
TLC—Total lung capacity; the volume of air in the lungs at maximal inflation.
VC—Vital capacity; the largest volume measured on complete exhalation after full inspiration.
Here are some other links that may help you:
http://en.wikipedia.org/wiki/Spirometry I don't normally cite wikipedia, but this one does give good defintions for the components of a PFT.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.