You mention that you've been over everything with the doctors and anesthesiologist, but is your son's endo in on it too? I would think it would be a good idea for the surgeon and endo to talk about the special procedures to take, before the surgery, and perhaps have an emergency # where your endo can be reached, just in case. Hope everything goes well - I'm sure your son will be fine, but I know how stressful even minor procedures can be, especially on the PARENTS! I will be praying for you both. God bless.