Well i'm a nurse who has worked in theatre and i think that whole kidney transplant story was ridiculous, even a medic like TJ supposedly is wouldn't be able to harvest and transplant a kidney with only scientists with limited medical knowledge as assistants, hell most fully qualified Doctors probably couldn't do it!!! You have to be a surgical specialist to even attempt it. It isn't as simple as the show portrayed and i would be surprised that a lone medic could accomplish it without dire consequences.
if they were trying for realism they really missed it there!!!