Doctors don't like confrontation any more than patients do; they may give in to a patient's request if it is made in an assertive manner. In a study under review for publication, Dr. Bylund found that patients who persistently asked for a specific treatment or test, based on Internet research, were more likely to get it than patients who came in with a vague list of symptoms, or who were more deferential to the doctor.
But be careful, she warned. Anyone who treats a doctor as a dispensary instead of a trusted medical guide loses the advantages of the physician's experience. Negotiating to win, in this case, may get you what you want, but not what you need.