@19rose63 As @jerdonus said, lots of various breathing. Deep breath, long exhale, etc. I sat in a chamber and put a clip on my nose while doing each breathing segment. It is not a difficult test, nothing to be worried about. I am on the patient portal and received my results the next day. They may be a little difficult to understand but at the very end of the report was a small summary that helped. It is best to let your doctor explain the results. Although, I did an internet search on the results to get some info before my follow up visit. Best of luck!