One thing you can always count on during a trip to the doctor's office is signing some paperwork. There will probably be an intake document that provides or confirms your information as well as discloses the reason for your visit. You will also likely have a form explaining your HIPPA rights. Also among the forms you receive, you may find an informed consent form.
An informed consent form gives a doctor your permission to proceed with a procedure or treatment. To be a truly informed patient you should wait and sign that form until you have had a chance to sit with your doctor and discuss what it allows the doctor to do, what the risks are, and what the alternatives are. While these forms are not a guarantee that things will go smoothly they allow you, the patient, to be confident in your decision to proceed with or decline treatment based on the best information you can gather.