The researcher must adhere to the informed consent (IC). It is generally used in medicine. Is the formal medical procedure, an ethical requirement, and a right recognized by the legislations of all countries, whose objective is to apply the principle of patient autonomy. It implies the obligation to respect patients as individuals and honor their preferences. It is the authorization that a person with full physical and mental faculties makes so that the health professionals can carry out a diagnostic or therapeutic procedure after having understood the information provided about them.