Ethical Considerations

7 min read Updated Mar 26, 2026

In the 1930s, researchers from the U.S. Public Health Service began studying the natural progression of syphilis in a group of Black men in Tuskegee, Alabama. The men were told they were receiving free treatment for “bad blood.” In reality, they received no treatment at all - even after penicillin became the standard cure in the 1940s. The study continued for 40 years. Men died, went blind, and passed the infection to partners and children. When the study was exposed in 1972, the public outrage led directly to modern research ethics regulations.

Research ethics exist because the history of science includes genuine atrocities. The MCAT tests your knowledge of the ethical principles and oversight mechanisms that now protect human subjects - and occasionally presents passages based on historical cases like Tuskegee.

Informed consent means that participants must be given all relevant information about a study and must voluntarily agree to participate. It is not a form you sign once - it is an ongoing process.

The core elements of informed consent:

Purpose of the study and procedures involved
Risks and benefits of participation
Voluntary participation - the right to withdraw at any time without penalty
Confidentiality - how data will be protected
Contact information for questions or concerns

Consent must be given freely, without coercion. A prisoner who is offered early release for participating is not giving truly voluntary consent. A patient who is told by their doctor to “definitely enroll” is under undue influence.

Institutional Review Board (IRB)

The Institutional Review Board (IRB) is an independent committee that reviews and approves all research involving human subjects before the study begins. Every university, hospital, and research institution has one.

The IRB evaluates whether:

Risks to participants are minimized and reasonable relative to potential benefits
Informed consent procedures are adequate
Participant selection is fair (not targeting vulnerable populations unfairly)
Data is kept confidential
Extra safeguards exist for vulnerable populations

No human subjects research can proceed without IRB approval. Even changes to an already-approved study must be reviewed.

The Belmont Report and Four Principles

The Belmont Report (1979), written in response to the Tuskegee scandal, established three core principles for research ethics. The MCAT often tests these alongside a fourth principle from biomedical ethics:

1. Respect for Persons (Autonomy): Individuals are autonomous agents and should make their own decisions about participation. Those with diminished autonomy (children, cognitively impaired individuals) deserve extra protections.

2. Beneficence: Researchers must maximize potential benefits and minimize potential harms. This is a positive duty - you must actively do good, not just avoid harm.

3. Non-maleficence: “First, do no harm.” Researchers must not expose participants to unnecessary risk. This is the negative duty - do not cause harm.

4. Justice: The benefits and burdens of research must be spread fairly. Vulnerable populations should not bear a disproportionate share of research risk while others receive the benefits.

Vulnerable Populations

Certain groups need extra ethical protections because their ability to give truly voluntary, informed consent is compromised:

Children: Cannot consent; require parental permission (consent) plus the child’s assent
Prisoners: Institutional setting creates coercive pressure; any incentives may be unduly influential
Pregnant women: Research may affect the fetus, who cannot consent
Cognitively impaired individuals: May not fully understand the risks and procedures
Economically disadvantaged people: Financial incentives may constitute undue inducement

Deception in Research

Sometimes telling participants the true purpose of a study would invalidate the results. If participants in a conformity study know they are being tested on conformity, they will behave differently.

Deception is permissible only when:

The study cannot be done without it
The research has significant scientific or educational value
No reasonable alternative exists
Participants are not exposed to significant risk
Participants are debriefed afterward - told the true purpose, why deception was necessary, and given the chance to withdraw their data

Debriefing is mandatory after any study involving deception. The researcher must explain what was actually being studied, why the deception was necessary, and answer any questions.

Confidentiality and Privacy

Researchers must protect participants’ personal information. Data should be anonymized or de-identified whenever possible. If data cannot be anonymized, access should be restricted and data should be stored securely.

Anonymity means the researcher cannot link data to individual participants (no names, no identifying codes). Confidentiality means the researcher can link data to individuals but promises not to disclose it.

A researcher conducts a study where participants are told they are testing memory, but the study actually measures racial bias. Which ethical requirement must be met after the study?

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Debriefing is required. After a study involving deception, the researcher must explain the true purpose of the study, explain why deception was necessary, and give participants the chance to withdraw their data. Deception is only permissible when the study cannot be conducted without it and when participants are not exposed to significant risk.

A clinical trial offers prisoners reduced sentences for participation. Which ethical principle is most directly violated?