Vulnerable groups in research
- Topic
Some people are more likely to be pressured or harmed in a study; they are included only with extra protections.
What it is
A group is vulnerable in research when it is less able to protect its own interests: through lack of decision-making capacity, dependence on an authority, poverty or discrimination. Examples: children, adults without capacity, people deprived of liberty, the investigator's students and employees, military personnel, pregnant women and marginalized communities. Modern ethics does not exclude them by default, because that would leave them without evidence for their own treatment; it includes them only if the study responds to their needs and with extra safeguards.
Key facts
- Helsinki, paras. 19–20: specific protection for people and groups in particularly vulnerable situations.
- Helsinki, paras. 28–29: those who cannot consent take part only if the study may benefit them or carries minimal risk and burden; their assent is sought and their refusal respected.
- CIOMS, guidelines 15 to 19: vulnerable persons, adults without capacity, children and adolescents, women, pregnant and breastfeeding women.
- CIOMS, guideline 3: fair distribution of burdens and benefits in the selection of participants.
Vulnerable groups and safeguards in Colombia
| Group | Main safeguard | Resolution 8430 |
|---|---|---|
| Minors | Representative's consent and the minor's assent | Arts. 23–28 |
| Adults without capacity | Legal representative and certification of capacity | Arts. 16 and 25 |
| Pregnant and breastfeeding women | Prior studies in non-pregnant women; minimal risk to the fetus | Arts. 29–38 |
| Subordinate groups | Group representative on the committee; refusing has no consequences | Arts. 45–46 |
In clinical practice
- In children, the study is first done in adults and animals, unless it studies a condition specific to that age (Resolution 8430, art. 24).
- In women of childbearing age and greater than minimal risk studies, absence of pregnancy is certified and the chance of pregnancy is reduced (art. 29).
- In pregnant women, a study without therapeutic benefit may not exceed minimal risk for the woman, embryo or fetus (art. 32).
- Investigators do not decide on ending a pregnancy nor offer incentives for it (art. 35).
Legal framework in Colombia
- Resolution 8430 of 1993, arts. 25–26: consent of whoever holds parental authority or legal representation, certification of capacity and the participant's assent where possible.
- Resolution 8430, arts. 27–28: with risk and direct benefit, the risk is justified by the benefit; without direct benefit, strict conditions and committee oversight apply.
- Resolution 8430, art. 30: in pregnant women, the consent of the spouse or partner is also required, except for incapacity, impossibility, abandonment or imminent risk.
- Resolution 8430, arts. 45–46: students, hospital and laboratory workers, military personnel and prisoners are subordinate groups; the committee includes a representative of the group.
Test yourself
Think of the answer, then tap the question to see it.
What condition does Helsinki set for research with a vulnerable group?
That the study responds to the health needs and priorities of that group and that the group can benefit from the resulting knowledge or interventions (para. 20).
Which groups does Resolution 8430 of 1993 consider subordinate?
Students, laboratory and hospital workers, employees, members of the armed forces, people held in detention centres and other groups whose consent may be influenced by an authority (art. 45).
Why is it not ethical to always exclude pregnant women from research?
Because they are left without evidence on how to treat their illnesses; CIOMS (guideline 19) asks for their inclusion with suitable protections.
What is required in Colombia before testing in children a procedure that is not specific to their age?
That similar studies have first been done in adults and in immature animals (Resolution 8430, art. 24).
Connections
Educational content on ethics and health law; not legal advice. Laws and case law change: each page links the official text and says when it was last checked. For a real case, read the text in force and ask a lawyer or the medical ethics tribunal.
Sources: Resolución 8430 de 1993: normas científicas, técnicas y administrativas para la investigación en salud (Ministerio de Salud (now Ministerio de Salud y Protección Social), 1993); International Ethical Guidelines for Health-related Research Involving Humans (Council for International Organizations of Medical Sciences (CIOMS) and World Health Organization, 2016); WMA Declaration of Helsinki – Ethical Principles for Medical Research Involving Human Participants (World Medical Association, 2024).
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Representative model, for educational purposes only.