Regionals are very unlikely to do any kind of medical exam.
The one exception I know of is Eagle wich will put you through an extremely rigorous AA mainline medical check. This exam is almost equivalent to an astronaut medical.
I meant to give you this website before. These guys are airline medical specialists, and have helped a lot of people. There is a lot of free info on the site:
http://www.aviationmedicine.com/inde...useaction=home