The FEV1 is a measure of how much air, as measured in liters, you can blow out in the first second of your blow. That's part of the blow,blow,blow part of the study. It's the figure that we often refer to as our "lung function". In the test results you see predicted (what a normal person would blow), actual (what you blew) and then the percentage, and that's where you find the basis for the statement: My lung function is about 36%, and reflects what you did compared to normal, expressed in a percentage.

I'm not totally sure of this, but one of the major values to look at in a PFT report is the FVC/FEV1 ratio, also called modified Tiffeneau-Pinelli index, and I think that's sometimes referred to as the TIFF. If this value is under 80%, it is a clear sign of obstructive disease as opposed to restrictive disease.

You stumped me on TIFF, @A MyCOPDTeam Member. I only know that acronym as a file format for sharing or transferring data.

As for your FEV1, that is your Forced Expiry Volume for how quickly and how long you can empty your lungs after a deep inhale. It’s part of the numerical data collected and reported on in a PFT (Pulmonary Function Test) exam results.

Happy Wednesday, 12-JUL-23

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A MyCOPDT...

Great explanation; thanks Jean.

Never heard of either.

Don't know, never heard of either