I had my TTT at Cleveland. They will have you hooked up to a heart monitor at all times w/BP. You tell them if you feel yucky. You can also tell them to stop. What is great is that they told me my results right afterward (pots) and sent me the reports. They told me that they can calculate results based on how much medicine you are on. So pay attention to the time when you take medicine. I personally avoid doing anything other than medicine prior to testing that helps with symptoms, such as support stockings. I would not wear support stockings for the entire day prior to the testing. I also would not take any of the herbs/vitamins that help me for a couple of days before the test. Caprice