Take your own ostomy supplies with you. Prepare yourself to do some expert communicating, especially if you go to a hospital where ostomy patients are not often seen, or if you go for a condition not related to your ostomy.
Do not assume that all hospital personnel are knowledgeable about ostomies. Do not submit to any procedures which you think may be harmful to your stoma. If you are in doubt about any procedure, refuse to have it performed until you have talked to your doctor. It is your right not to have procedures done if you believe they could be harmful to you.