Month August 2014

One of the key reasons to perform spirometry is to measure expiratory flow rates. The flow rate of air through any system is primarily a function of driving pressure and resistance. Since there are…

I was contacted recently by a reader who is trying to resurrect an older test system.  It is a Spirotech S600, manufactured by Graseby-Andersen and outfitted for spirometry, helium dilution lung vo…

There are a couple of different ways to assess changes in FEV1 from one patient visit to another. For several decades my lab has used a change of >=10% and >=200 ml as the threshold for a sig…

I’ve had a number of reports across my desk in the last couple of weeks with both elevated and reduced FRC’s that were associated with a more-or-less normal TLC. I reviewed the raw data…