So in a clinical trial, you may still have to pay outside hospital charges for standard stuff. Sometimes in a clinical trial that the government pays for completely, like at NIH where I used to work, they pay for everything. Or a company might pay (some perhaps) as they promote eventually use of their instrument in papers. But often times you pay a fee at Mayo (for example) or Yale or where-ever, and after procedure is done. I was in the Mayo clinical trial for FLA but this years biopsy made me in-eligible to be in the trial anymore since I have more than one lesion now, but at Mayo you still would need to pay for the FLA procedure itself.