Before joining a clinical trial, a person must understand what they are getting into. Informed consent is the process of providing that understanding, and it is more than a signature on a form. It is a conversation between the research team and the participant, covering the purpose of the study, the procedures involved, the risks and benefits, the alternatives, and the right to withdraw at any time. The participant must be competent to decide and must give consent freely, without coercion.

The consent document is written in plain language, at a reading level the participant can understand. It includes the purpose of the research, how long it will last, what will happen during the study, any foreseeable risks, potential benefits, compensation, confidentiality protections, and contact information for questions. It also states clearly that participation is voluntary and that refusing or withdrawing will not affect their regular medical care. The process is ongoing. If new information emerges during the trial, participants must be informed and may need to re-consent.

Essential elements:

• Purpose and procedures. What the study is testing and what participants will do.
• Risks and benefits. Honest disclosure, including unknown risks.
• Alternatives. Other options, including standard treatment or no treatment.
• Voluntariness. The right to refuse or withdraw without penalty.
• Confidentiality. How data will be protected.

Vulnerable populations, including children, prisoners, and cognitively impaired adults, require additional protections.