Informed Consent: Who Owns the Decision About the Human Body?
Informed consent is not a signature but a process: information, comprehension, decision-making capacity, voluntariness, and a genuine ability to refuse. This article connects the history of research ethics with clinical care, public health, data, neurotechnology, and the limits of autonomy.
Informed consent is often reduced to a signature on a form. But a signature alone does not show that a person understood what would happen, had a genuine choice, or decided without pressure. Ethically, consent is a process of communication and decision-making, not a bureaucratic moment.
In medicine and research, that process carries special weight because the decision concerns the body, health, privacy, and sometimes life itself. Yet autonomy is not mathematically absolute: questions arise about decision-making capacity, emergencies, children, public health, the rights of others, and technologies whose effects extend beyond one individual.
This article therefore asks more than whether someone said “yes.” It asks whether that yes was informed, understood, voluntary, specific, and revocable — and whether the surrounding system genuinely allowed a safe and practicable “no.”
The central starting point is simple: for a capable adult, the decision about a medical intervention ordinarily belongs to that person. Any departure from that rule requires a distinct justification that is limited, reviewable, and proportionate.
Consent is not a signature on a form
A form can be important evidence that a conversation was documented, but it cannot replace the conversation itself. A person can sign something they did not understand, under pressure, without time to think, or while believing refusal is not allowed. Such a signature is a formal act, not necessarily valid informed consent.
Contemporary ethical standards therefore emphasize communication: explaining the purpose of an intervention, its benefits, material risks, alternatives, and the option of not proceeding. The key question is not merely “do we have a signature?” but “did this person have the conditions required for a real decision?”
The title question does not mean that the human body must literally be treated as legal property in the same way as an object. Voluntary Cooperation and the Free-Rider Problem already showed that self-ownership can illuminate bodily autonomy while still failing to reduce every right to property language.
For this article the more practical boundary matters: a capable person is a moral and legal subject, not material for others to use. A physician, researcher, state, family member, or company may have expertise, responsibilities, or legitimate interests, but those facts alone do not create a general title over another person’s body.
Medicine was long organized in strongly paternalistic ways: the physician was presumed to know what was best, and the patient’s wishes could be secondary. Modern medical ethics shifted toward self-determination, but not toward the claim that expertise no longer matters. The better model is neither “the physician decides” nor “the physician only hands over a menu,” but professional explanation, dialogue, and a decision by the person who will bear the consequences.
In Anglo-American legal history, Schloendorff v. Society of New York Hospital (1914) is often cited for the principle that a competent adult determines what shall be done with their body. It is not a universal global statute, but it is a historically important expression of the shift from the body as an object of treatment to the patient as a decision-maker.
Bare permission answers only whether a person agreed. Informed consent additionally requires that the decision be based on relevant information. The U.S. case Canterbury v. Spence (1972) is important because it emphasized the patient’s need for information material to the decision, rather than only what the medical profession customarily chose to disclose.
This does not mean every theoretical possibility must be recited. It means disclosure should be sufficient for a patient to weigh the consequences of options that are genuinely relevant to the decision.
The Nuremberg Code: voluntariness after research abuse
After Nazi medical experiments, the Nuremberg Code of 1947 placed the voluntary consent of the research subject at the center of research ethics. The Code arose from an extreme historical context, but its lesson is broader: a human being cannot become a research instrument merely because an institution has a scientific goal.
The Code also stresses the participant’s liberty to end an experiment. Consent is therefore not a one-time surrender of control at enrollment; it remains connected to the ability to leave.
The U.S. Public Health Service study of untreated syphilis in Black men at Tuskegee ran from 1932 to 1972. The CDC now states explicitly that informed consent was not obtained and that treatment was not offered even after penicillin became widely available.
The case matters because it demonstrates another form of violation: not necessarily physical coercion into an experiment, but deception, non-disclosure, exploitation of unequal status, and withholding effective treatment. Its exposure helped drive major changes in U.S. protections for research participants.
The 1979 Belmont Report analyzed informed consent through three core elements: information, comprehension, and voluntariness. The framework remains useful beyond research because it shows why the sheer quantity of information does not create an autonomous decision.
A person may receive ten pages of technically accurate information and still not understand it. They may understand it but fear losing necessary care if they refuse. Or they may decide freely while important risks or alternatives were withheld. Each failure undermines a different part of consent.
In ordinary clinical care, disclosure should be tailored to the actual decision. Core elements include the purpose and nature of the intervention, expected benefits, material risks and burdens, reasonable alternatives, and the likely consequences of declining or delaying treatment.
Information is not adequate merely because it is technically correct. Timing, language, and the opportunity to ask questions also matter.
A material risk is not equally important to everyone
Two people can reasonably value the same risk differently. A small risk of permanent voice damage may be acceptable to one person but decisive for a professional singer. Informed consent therefore involves more than transmitting statistics; it connects medical facts with the values of a particular person.
This is one reason modern ethics emphasizes shared decision-making: clinicians know the medical options, while patients usually know their own goals, fears, priorities, and life context better.
An explanation can be formally complete yet practically useless if it is rushed, overloaded, filled with jargon, or delivered during severe fear or distress. Belmont therefore treats the manner and context of communication as part of informed consent, not as decoration.
A good process checks whether the person has grasped the essentials. This is not a medical exam; it is an attempt to confirm that the person can describe in their own words what is proposed, what the major alternatives are, and what consequences matter.
Coercion is clearest when someone threatens harm. But choice can also be distorted by undue influence: dependence on a physician, employer, or institution; a disproportionate reward; fear of losing a service; or a belief that authority may not be contradicted.
This does not mean all persuasion is impermissible. A clinician may clearly recommend the option they judge best. The boundary appears when recommendation begins to erase the person’s genuine ability to refuse.
The World Medical Association’s Declaration of Helsinki specifically warns about potential research participants who are dependent on the researcher or may consent under duress. In such cases, consent should be sought by an appropriately qualified person independent of that relationship.
The wider principle is intuitive: the more power one party holds over the future of another, the more caution is required before calling the other person’s “yes” fully free.
Decision-making capacity is not a reward for choosing correctly
A person does not lack capacity merely because they choose an option that the physician, family, or majority considers unwise. The key question is whether the person can understand relevant information and implications and make an independent decision.
Capacity is also decision-specific. Someone may be able to decide about a simple intervention yet be unable to evaluate a highly complex risk while delirious or severely cognitively impaired. Contemporary ethics therefore calls for assessment of actual capacity rather than automatic exclusion based on diagnosis.
Pain, medication, hypoxia, acute psychosis, delirium, or temporary unconsciousness may reduce or remove decision-making capacity. In some cases capacity may return within hours or days. When a decision is not urgent, it may therefore be ethically important to wait, treat a reversible cause, or repeat the discussion at a better time.
The goal is not to find a reason to exclude someone from decisions, but to preserve their participation to the greatest extent the circumstances allow.
When a person lacks decision-making capacity, a legally authorized representative or health-care proxy may take part in decisions. But the surrogate does not become the owner of the patient’s body. The task is to follow the person’s known values and prior wishes as far as possible, and otherwise protect the person’s interests.
Advance directives, prior statements, and conversations with close others therefore matter: they can preserve continuity of autonomy when the person cannot currently speak for themselves.
Children do not generally have the same legal authority to consent as competent adults, but this does not make their views irrelevant. The Oviedo Convention requires a child’s opinion to carry increasing weight with age and maturity; research ethics also uses the concept of assent when a child is able to participate meaningfully.
Land, Housing, and Rent: Who Captures the Value of Place? established a related boundary: a child belongs neither to the state nor to parents. Parental or guardian decision-making is a responsibility to protect the child and promote the child’s interests, not an unlimited right to dispose of the child’s body.
The right to consent includes a right to refuse
Consent means little if “no” is not permitted. For a capable adult, modern medical ethics generally recognizes a right to decline treatment even when the clinician strongly recommends it and, in some jurisdictions, even when refusal may be life-threatening.
This does not relieve clinicians of the duty to explain consequences, check understanding, and correct misconceptions. The distinction is between professional persuasion and overriding a capable person.
Consent yesterday is not automatic consent tomorrow. The Oviedo Convention expressly recognizes that consent may be freely withdrawn, and research standards likewise recognize a participant’s right to leave a study.
Withdrawal can face practical limits: an operation cannot always be reversed mid-step, and truly de-identified data may no longer be traceable to one person for deletion. Such limits should be explained in advance rather than appearing as surprises after consent is given.
If a person is unconscious, needs immediate care, and no surrogate is available, many systems allow urgently necessary treatment without prior consent. The purpose is to prevent serious harm when consent cannot realistically be obtained — not to make routine care easier.
When the emergency ends or the person regains decision-making capacity, control should return to the patient or appropriate surrogate. A temporary exception does not create permanent authority.
The primary aim of treatment is to help a particular patient. The primary aim of research is to generate generalizable knowledge, even though a participant may also benefit personally. The distinction matters because people can mistakenly assume every research intervention was chosen solely for their own best medical interest.
Research consent therefore needs particular clarity about experimental uncertainty, randomization, placebo use, withdrawal, and which parts of an encounter are research rather than ordinary care.
The 2024 Declaration of Helsinki: consent remains a process
The World Medical Association most recently revised the Declaration of Helsinki in October 2024. The current version requires researchers to ensure that a potential participant has understood the information before seeking freely given informed consent, ordinarily documented on paper or electronically.
It also contains specific safeguards for dependent relationships, people unable to consent, assent, emergency research, and the use of biological material and identifiable data. Modern consent ethics is therefore not a single rule but a system of protections for different situations.
Not absolutely. Some research systems permit narrow waivers or exceptions, for example for certain minimal-risk research, secondary uses of data, or emergency research in which consent cannot be obtained in time. But these are not automatic exemptions.
They generally require legal authority, independent ethics review, proportionality, and additional safeguards. “Benefit to science” by itself is not enough to erase personal autonomy.
Some behavioral research cannot work if participants know the full purpose in advance. Belmont allows incomplete disclosure only under constrained conditions: when it is genuinely necessary for the method, does not conceal more than minimal undisclosed risk, and is followed by an appropriate debriefing plan.
Deception is therefore not an ordinary research entitlement. The greater the possible harm or effect on choice, the harder concealment is to justify.
A biological sample or health record can outlive the original clinical encounter by decades. The WMA Declaration of Taipei therefore treats the collection, storage, and reuse of identifiable health data and biological material as a distinct ethical field.
People should know the purposes of collection, access rules, privacy protections, possible secondary or commercial uses, and what happens to withdrawal once data are de-identified. “I agreed to a blood draw” is not automatically the same as “I agreed to every future use of the information that sample can produce.”
Neurotechnology: consent can include mental privacy
Brain-computer interfaces and other neurotechnologies can generate data linked to neural activity, behavior, or cognitive states. UNESCO adopted its first global Recommendation on the Ethics of Neurotechnology in 2025, with human dignity, autonomy, and mental privacy among the central concerns.
For such systems, consent is not only about implanting or using a device. Later software updates, new analytic uses, transfers to outside providers, cybersecurity, and functions that did not exist at the moment of original consent can all become ethically relevant.
The classic picture assumes that a person consents to one intervention and the matter is settled. Connected devices, digital therapeutics, and AI systems can change after deployment. The ethical question therefore includes when a material change in function requires renewed consent.
If a device originally used for therapy begins collecting additional data, introduces behavioral or commercial functions, or materially changes its algorithmic decision process, old consent should not automatically cover everything technology later makes possible.
In somatic gene therapy, a patient can in principle consent to an intervention in their own body under ordinary requirements of safety and research ethics. Heritable genome editing is different because effects may extend to future descendants who cannot consent.
Parental permission therefore cannot settle the whole ethical question. WHO emphasizes broader governance and oversight for human genome editing. Consent is necessary, but it is not a magic permission that removes risks to third parties or future generations.
Contagious disease can create a conflict between individual liberty and direct risk to others. It is important to separate two questions: whether a medical intervention in the individual is voluntary, and whether public authorities may restrict certain conduct or movement to prevent harm to others.
Serious public-health ethics therefore begins neither with “the state may do anything” nor with “the individual may always refuse every consequence.” It asks whether a measure is lawful, necessary, proportionate, non-discriminatory, and whether a less restrictive option is available.
The least restrictive measure is an important safeguard
WHO ethics guidance for infectious disease and public-health emergencies emphasizes the least restrictive means: a more coercive measure becomes easier to justify only when less restrictive approaches cannot reasonably achieve an important protective goal.
The principle does not make every restriction wrong. It requires authorities to justify each additional intrusion and to end exceptional measures when their justification no longer exists.
Slovenia’s Patient Rights Act defines decision-making capacity and gives patients a right to information about their condition, the purpose and manner of an intervention, expected benefits, material risks, consequences of non-treatment, and alternatives. A patient who has decision-making capacity generally may not undergo a medical intervention without prior free and conscious consent based on that explanation.
The Act also recognizes refusal and withdrawal of consent while providing defined exceptions, including urgent medical assistance when a patient cannot decide, and a boundary on refusal when the life or health of others would be seriously endangered. It illustrates the broader structure of modern bioethics: a strong presumption of autonomy with limited legally defined exceptions.
The Convention on Human Rights and Biomedicine states that a health intervention may be carried out only after the person has given free and informed consent, following appropriate information about purpose, nature, consequences, and risks, and that consent may be withdrawn at any time. Slovenia has ratified the Convention.
Its broader framework also matters: the interests and welfare of the human being prevail over the sole interest of society or science. This directly rejects the idea that a person may be used merely because an institution’s objective is important or noble.
Some people do not want every predictive fact about their health. European bioethical standards also recognize that a person may prefer not to receive certain health information. That does not give an institution a blank authorization to withhold whatever it chooses.
A person may also choose to delegate part of a decision to a clinician or trusted other. Such delegation can itself be autonomous, provided it is voluntary and the person understands roughly what authority is being delegated.
Can consent make anything ethical?
No. Consent is a powerful ethical requirement, but it is not the only one. A person may agree to a dangerous, ineffective, or professionally inappropriate intervention; that does not erase the clinician’s or researcher’s responsibility for safety, scientific validity, and a reasonable balance of benefit and risk.
Likewise, a research project can have an excellent consent form and still be unethical if it is scientifically pointless, excessively dangerous, or unjustly recruits vulnerable groups. Autonomy is essential, but it operates alongside beneficence, non-maleficence, and justice.
Exit, Voice, and Loyalty: What Do We Do When a System Fails? showed that political uses of the word consent can hide different concepts. The same is true in health care. A person may formally choose an option because alternatives are inaccessible, because they depend on an employer or insurer, or because refusal would carry a disproportionate economic or social cost.
This does not make every choice made under inequality invalid. It means we should distinguish the validity of a particular consent from the fairness of the system that structured the available options.
Payment for time, travel, or inconvenience in research is not inherently unethical. HHS explicitly recognizes that paying research participants is common and often acceptable. The ethical concern appears when an offer becomes so powerful in a person’s vulnerable circumstances that it distorts risk assessment.
There is no universal monetary threshold. Relevant factors include the level of risk, the participant’s economic vulnerability, the way payment is offered, and whether refusing participation threatens access to something the person would otherwise receive.
Digital systems often rely on a one-time click beneath long terms of service. For sensitive health, genetic, or neural data, that is a weak approximation of informed consent, especially when future uses are unpredictable or commercially valuable.
A stronger model separates the purpose of collection, secondary uses, sharing, retention, withdrawal, and the real limits of deletion. Personal Dependency Audit: What Does My Life Actually Depend On? similarly showed that data ethics is not only about privacy but also about control over infrastructure that determines what can be done with information.
The limits of consent and human dignity
With artificial intelligence, genomics, and neurotechnology, it is tempting to imagine that ethical problems disappear once the user clicks “I agree.” They do not. Individual consent cannot by itself repair a discriminatory model, an unsafe product, a systemic cybersecurity flaw, or harm imposed on third parties.
Two layers are therefore required at once: genuine individual consent and independent rules governing safety, evidence, privacy, access, accountability, and oversight.
A practical test can be reduced to five questions. First, did the person receive the relevant information? Second, did they understand it? Third, did they have capacity for this particular decision? Fourth, was the decision voluntary and free from coercion or undue influence? Fifth, could they realistically refuse or later withdraw?
If one of these elements fails, a signature does not solve the problem. If all five are satisfied, separate questions of safety, justice, and the rights of others still remain.
This article does not claim that every health intervention without an explicit written signature is violence; many systems recognize oral or behaviorally expressed consent for ordinary care. It does not claim that every public-health restriction is illegitimate. Nor does it claim that a person who lacks full capacity has no autonomy at all.
The argument is proportional instead. The more serious the intervention in the body or the stronger the override of a person’s wishes, the stronger the justification, evidence, legal authority, procedural safeguards, and independent review should be.
Informed consent is a practical expression of a broader principle: a person is not merely an object of medicine, science, technology, or policy. The human body is not an open resource that others may use whenever they believe they have a worthy goal.
But the limit of the principle matters too. Consent does not make an unsafe intervention safe, erase duties to third parties, or settle questions of justice. The mature answer is therefore structural rather than absolute: the decision ordinarily belongs to the person; exceptions must be narrow and justified; and institutions must demonstrate respect for the person even when that person’s “no” is inconvenient.
Sources and further reading
- THY-REALITY R53 — Ali so vse pravice lastninske pravice? / Are All Rights Property Rights? (LOCKED): self-ownership as a model of bodily autonomy, with limits to literal property reduction.
- THY-REALITY R55 — Ali soglasje legitimira oblast? / Does Consent Legitimize Authority? (LOCKED): distinctions among actual, tacit and hypothetical consent.
- THY-REALITY R71 — Otrok ni last države niti last staršev / A Child Belongs Neither to the State nor to Parents (LOCKED): evolving capacities, participation and parental responsibility.
- THY-REALITY R101 — Izredna pooblastila: zakaj začasna moč rada ostane? / Emergency Powers: Why Temporary Power Tends to Stay (LOCKED): necessity, proportionality, review and sunset safeguards.
- THY-REALITY R104 — Kdo nadzoruje podatke o nas? / Who Controls Data About Us? (LOCKED): privacy, data control and infrastructure dependence.
- THY-REALITY R127 — Transhumanizem: od zdravljenja do preoblikovanja človeka / Transhumanism: From Healing to Transforming the Human Being (LOCKED v2).
- THY-REALITY R128 — Možgansko-računalniški vmesniki: ko se možgani povežejo s strojem / Brain-Computer Interfaces: When the Brain Connects to a Machine (LOCKED).
- THY-REALITY R130 — Izboljševanje človeka: terapija, nadgradnja in nova neenakost / Human Enhancement: Therapy, Upgrade and a New Inequality (LOCKED).
- THY-REALITY R135 — Evgenika: kako je »izboljševanje človeštva« postalo politični projekt / Eugenics: How “Improving Humanity” Became a Political Project (LOCKED).
- Schloendorff v. Society of New York Hospital, 211 N.Y. 125 (1914), historical self-determination principle as quoted in later New York case law.
- Canterbury v. Spence, 464 F.2d 772 (D.C. Cir. 1972): patient-centered materiality of disclosure in informed consent.
- U.S. HHS Office of Research Integrity — Nuremberg Code: Directives for Human Experimentation.
- U.S. HHS Office for Human Research Protections — Belmont Report (1979): respect for persons, beneficence, justice; informed consent as information, comprehension and voluntariness.
- CDC — About the U.S. Public Health Service Untreated Syphilis Study at Tuskegee: lack of informed consent and withholding of available treatment.
- CDC — Effects on Research after the Untreated Syphilis Study at Tuskegee: National Research Act, IRB review and consent reforms.
- World Medical Association — Declaration of Helsinki, 2024 revision: free and informed consent, dependent relationships, assent, emergency research, data and biological material.
- World Medical Association — Declaration of Taipei on Health Databases and Biobanks: consent, privacy, secondary use and governance of identifiable data/material.
- Council of Europe — Oviedo Convention / Article 5 and explanatory material on free and informed consent.
- Republic of Slovenia PISRS — ratification of the Convention on Human Rights and Biomedicine (Oviedo Convention).
- Republic of Slovenia PISRS — Zakon o pacientovih pravicah (ZPacP), especially Articles 20, 26–31 and decision-making capacity.
- UNESCO — Universal Declaration on Bioethics and Human Rights: autonomy, consent, dignity and human-rights framework.
- American Medical Association Code of Medical Ethics Opinion 2.1.1 — Informed Consent.
- American Medical Association Code of Medical Ethics Opinion 2.1.2 — Decisions for Adult Patients Who Lack Capacity.
- American Medical Association Code of Medical Ethics — Advance Directives and emergency decision-making.
- HHS OHRP — Informed Consent FAQs: coercion, undue influence, timing and participant remuneration.
- U.S. FDA — Protection of Human Subjects; Informed Consent, including emergency exceptions and prohibition of exculpatory language.
- WHO — Guidance for Managing Ethical Issues in Infectious Disease Outbreaks: necessity, proportionality and least restrictive alternatives.
- WHO — Human genome editing: recommendations and governance framework (2021).
- UNESCO — Recommendation on the Ethics of Neurotechnology, adopted November 2025; autonomy, mental privacy and human dignity.
- Council of Europe — Informed Consent, Autonomy and Decision-Making in health and AI; Oviedo-based consent principles.