The Fourteenth Amendment says that no State shall deprive you of your life, liberty or property without due process. Liberty is the freedom to say NO.
Informed consent and the right to give consent before any medical procedure is applied is the right of every human being on the planet. For example, the following is from the United Nations:
The right to health contains freedoms. These freedoms include the right to be free from non-consensual medical treatment, such as medical experiments and research or forced sterilization, and to be free from torture and other cruel, inhuman or degrading treatment or punishment.