Like all lung volume tests, the helium dilution technique produces a lot of numbers, most of which are not included on the report. Obviously we had some kind of equipment problem with that test system but it took a bit of sleuthing before I found out what had happened. ![]() When I checked the other reports for the day I found that two other patients that had had their lung volumes measured on the same test system also had a TLC, FRC and RV that were noticeably reduced. This is somewhat unusual for helium dilution lung volume since most errors usually cause FRC, RV and TLC to be over-estimated instead of being under-estimated. In particular the FRC and RV are markedly reduced. When compared to the FVC and the VA (from the DLCO test) the lung volumes are significantly lower. What caught my eye was that the TLC and the FRC didn’t particularly fit in with the results from the other tests the patient had performed. ![]() Recently I was reviewing a report that included helium dilution lung volumes.
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