The principle of autonomy is widely recognized to be of utmost importance in bioethics; however, we argue that this principle is often misapplied when one fails to distinguish two different contexts in medicine. When a particular patient is offered treatment options, she has the ultimate say in whether to proceed with any of those treatments. However, when deciding whether a particular intervention should be regarded as a form of medical treatment in the first place, it is the medical community who (...) has the ultimate say. Some argue that particular interventions should be allowed by virtue of the fact that they are autonomously requested. But making such an argument fails to distinguish between these two contexts and misapplies the principle of autonomy, ultimately having the potential to instigate problematic changes in the practice of medicine. (shrink)