Informed consent is the ethical heart of every clinical trial — and a guaranteed exam question. The single most important idea: consent is a process, not a signature. A signed form is only the documentation of a conversation in which the subject freely agreed to take part.
Definition
Per GCP 1.28, informed consent is “a process by which a subject voluntarily confirms willingness to participate, after being informed of all aspects relevant to the decision.” It is documented by a signed and dated informed consent form (ICF).
Three essential components
| Component | Meaning |
|---|---|
| Information | Adequate disclosure of all relevant trial aspects. |
| Comprehension | The subject understands the information given. |
| Voluntariness | A free decision, without coercion or undue influence. |
Essential elements to disclose (GCP 4.8.10)
- That the trial is research; its purpose, treatments and the probability of randomisation; and the procedures (including any invasive ones).
- Foreseeable risks (including to embryo/foetus/nursing infant) and expected benefits — or a statement that there are none.
- Alternative treatments; compensation and treatment for trial-related injury; any payment or expenses.
- Voluntary participation — the right to refuse or withdraw at any time without penalty.
- Confidentiality, with direct access to records by monitor/auditor/EC/regulator; that new information will be shared; contact persons; trial duration; and the number of subjects.
Documentation & process
- The ICF is approved by the Ethics Committee, written in a language the subject understands, with no coercive or exculpatory language.
- It is signed and dated by the subject (and by the person obtaining consent) before any trial procedure; a copy is given to the subject.
- Re-consent is required on new safety information or protocol amendments.
- In India, audio-visual recording of the consent process is required (NDCT) for vulnerable populations / specified trials.
Special situations
| Situation | Safeguard |
|---|---|
| Illiterate subject | An impartial witness is present throughout and also signs & dates the ICF. |
| Vulnerable (child, mentally ill, unconscious) | Consent by a Legally Acceptable Representative (LAR) + the subject’s assent where possible. |
| Children | Parental/guardian consent + the child’s assent. |
| Emergency | Waiver under strict conditions, with prior EC approval. |
Exam tip: consent = a voluntary process with three components — information, comprehension, voluntariness. Obtained before any procedure; signed & dated ICF, copy to subject. Illiterate → impartial witness; vulnerable → LAR + assent. AV recording in India for vulnerable subjects; re-consent on new information. Governed by GCP 4.8 and the NDCT 2019 Fifth Schedule.
Treat consent as a conversation you must be able to prove happened properly: full disclosure, genuine understanding, a free choice — documented, witnessed where needed, and refreshed whenever the facts change. That mindset answers every short note and viva on the topic.