I think that it's a good idea to plan your visit by writing down questions, as you think of them, then making a list from the most important questions to the least important questions. Type the list, making two copies, one for you and one for the specialist. You get a limited amount of time, so don't bring up things that are irrelevant to the specific concerns you have for the specialist. Be brief, be blunt. By planning ahead, I can cram in a lot into a short visit. And these days, the visits are getting shorter and shorter.