informed consent

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Consent by a person to undergo a medical procedure, participate in a clinical trial, or be counseled by a professional such as a social worker or lawyer, after receiving all material information regarding risks, benefits, and alternatives.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun consent by a patient to undergo a medical or surgical treatment or to participate in an experiment after the patient understands the risks involved