The Endopat is interesting. It's not painful but it is uncomfortable. It's purpose is to measure how quickly and thoroughly endothelial tissue rebounds after obstruction or obstruction, which is, in a sense, a test for stroke-safety. I went to a superstar cardiologist I could find, about 18 years ago as my relatives all died from heart disease and/or stroke in one form or another. Dr. A. put me through every test that might suggest a threat and the Endopat was the last one so I added it to not leave a stone unturned. The test itself includes wearing something similar to a tight blood pressure cuff for about 15 minutes and the software charts the various parameters as the tissue rebounds. The tests were reassuring as, despite bad genes and high cholesterol, the blood work categorized me as A/optimal risk profile, based primarily cholesterol molecule size. And backed-up by great non-bloodwork test results. So the kind of cholesterol can be more significant than the amount.