Which statement best describes a requirement of informed consent?

• A. It is a one-time administrative requirement
• B. It may be optional for some subjects
• C. It may be completed only after trial participation
• D. It must be voluntary and based on information provided

Answer: (D)

Informed consent is a process that protects a person’s autonomy by ensuring they understand what participation in a study involves and agree to it freely. The requirement is that consent must be voluntary and based on information provided. The investigator must give clear, comprehensible details about the study’s purpose, procedures, risks and potential benefits, alternatives to participation, how data will be used and kept confidential, and the participant’s right to withdraw at any time. This information should be explained before any study procedures occur, and the consent should be documented, usually with a signed form. If the participant cannot provide consent, a legally authorized representative may do so.

This emphasis on voluntary agreement and understanding is why it’s the best description of the requirement. Other statements imply consent is merely administrative, optional for some, or possible only after participation, which would undermine the ethical and regulatory foundations of research.