Yes Angel it is role play but your right There are places where people study and get a degree to add to the authenticity and realism of the role play. Knowing as much as you can about the role your roleplaying makes the experience better for both your self and the people interacting with you.
2 schools I know of that offer Medical training for Second Life are
Whispering Winds Medical School
Hillman University
I have a PHD from Whispering Winds, you have to pay like any University course and you have assignments, practical work and tests and final exam. It is a big committment but worth if you want to add that little extra sense of professionalism to your role play. I do not believe doing such courses gives you everything you need to be a proficient Medical role player but it is a good place to start as both courses require internships where you can learn observing and gives you some basic medical knowledge for role playing. You learn from others and from your life experiences as well. learning from a Person who is a real life medical prefessional is great. It is all about making the SL experience realistic and rewarding.
All the best