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Informed consent for medical research is an essential, but challenging, process to assure the protection of the rights of potential research subjects. Numerous barriers to the informed consent process exist among patients, including impaired decisional capacity, impaired cognition, language barriers, illiteracy, insufficient time and communication, and numerous others. Because of the inherent vulnerability of patients, particular attention should be paid to addressing barriers to adequate informed consent, and steps should be taken to ensure adequate delivery of information, understanding of the study and its risks and benefits, and voluntariness of the informed consent.