I've found herp vets to be all about the exploratory diagnostics. It seems criminal to me. My vet wanted to do a bunch of tests on a snake he deemed healthy during a new animal exam, "just to see if there are any issues we have no other way of knowing about"...to include a full blood chemistry and x-rays. For a snake that wasn't sick! It was nothing but an attempt at exploitation.

Every time your vet wants to do a test, ask them what the possible outcomes of the test are, how likely each outcome is and how the outcome of the test would alter a treatment plan. Don't think that vets are above taking advantage of clients and calling it patient care. Exotics vets are among the lowest paid in the profession and all of the specialized training is very expensive.