Freely given informed consent must be obtained from every subject prior to clinical trial participation. Which option reflects a key aspect of this requirement?

• A. Consent is obtained after enrollment.
• B. Consent can be withdrawn at any time.
• C. Consent must be freely given and obtained prior to participation.
• D. Consent is sufficient if the subject signs a one-page form.

Answer: (C)

The central idea is that informed consent must be voluntary and obtained before any trial activities begin. This isn’t just signing a form; it’s a process where the subject is given adequate information, has time to understand it, can ask questions, and agrees to participate without coercion.

That’s why the best statement is that consent must be freely given and obtained prior to participation. It captures both voluntariness and the pre-participation timing required by ethical and regulatory standards. Obtaining consent after enrollment would violate the requirement that participation begin only after informed agreement. While the ability to withdraw at any time is important, it describes ongoing voluntariness, not the fundamental pre-participation step. And a one-page signature alone isn’t enough to ensure adequate disclosure and understanding, which are essential components of informed consent.