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Biomedical ethics, or bioethics, are the core moral principles that guide how healthcare professionals treat patients and navigate difficult moral decisions. These principles are grounded in common morality and shared norms for ethical behavior in medical care.
As a pre-med, you’re not just expected to know principles of bioethics. You’re expected to apply them. Admissions committees look for this in your personal statement, secondaries, situational judgment tests (SJTs) like Casper and PREview, and especially in interviews.
When applying to medical schools, it’s critical to demonstrate your understanding of these principles to increase your chances of acceptance and to serve your patients in the future. In this guide, I’ll break down all four principles of biomedical ethics, what each one actually looks like in practice, and how to talk about them in your application and interviews.
The Four Main Principles
Medical schools teach four foundational principles of biomedical ethics, originally outlined by bioethicists Tom L. Beauchamp and James F. Childress:
- Autonomy
- Beneficence
- Non-maleficence
- Justice
If you need a quick way to remember them, think: A-B-N-J. These principles aren’t just theory. The approach of principlism offers a practical framework for ethical decision-making in medicine. These principles help physicians navigate complex situations and moral issues in both clinical practice and medical research.
Autonomy
The idea of autonomy is rooted in self-determination and principles of respect. It means recognizing that patients, not the physician, have the final say in their care. Your role as a doctor isn’t to make decisions for patients, but to make sure they have the information needed to make voluntary decisions.
In practice, the principle of autonomy shows up through informed consent, communication, and respect for a patient’s values, even when those values conflict with your own medical opinion. It also requires that the patient has the capacity to understand their choices and the consequences that come with them.
Example of Autonomy: Respecting religious beliefs concerning blood transfusions. As long as the patient is of sound mind and grasps all the facts, the patient must be in control of the decisions.
Beneficence
Beneficence means “do good.” The principle of beneficence is about actively working in the best interests of the patient. It’s not just about avoiding harm, but about taking meaningful steps to improve a patient’s health, well-being, and overall quality of life.
Beneficence can look like advocating for a patient, helping them navigate the healthcare system, or taking extra time to ensure they feel supported and understood. Good physicians don’t just treat illness, but look for ways to promote better outcomes in the long term.
Example of Beneficence: Holding a patient’s hand during end-of-life care before their family can get there. It’s about doing the “right” thing that is not necessarily required of you.
Non-Maleficence
The principle of non-maleficence means “do no harm.” This principle asserts that healthcare providers have a duty to avoid causing harm to patients. In medicine, this isn’t always straightforward, as many treatments carry risks.
Physicians are constantly weighing potential harm against potential benefit. The goal isn’t to eliminate all risk, which is often impossible, but to ensure that any harm is justified by a greater good.
Example of Non-Maleficence: Weighing the potential risks and benefits of treating a pregnant woman with cancer. Chemotherapy can cause significant side effects, but it may still be the best option if it improves a patient’s chances of survival. In these situations, non-maleficence requires careful judgment and a deep understanding of what the patient values.
Justice
The principle of justice in medicine is about fairness, specifically how care and resources are distributed. It states that all individuals should have equal access to healthcare resources regardless of factors like race, gender, socioeconomic status, or health condition.
This principle becomes especially important in situations where resources are limited or when systemic inequalities affect health outcomes. Physicians must consider the individual patient in front of them and broader issues like access to care, socioeconomic barriers, and implicit bias.
Example of Justice: Equitably distributing limited resources to people who need those resources. During the COVID-19 pandemic, healthcare professionals in New York faced difficult decisions about who would receive treatment when resources were scarce.
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Additional Concepts
Beyond the four core principles, there are a few additional ethical principles that come up often in both clinical settings and med school interviews, particularly in terms of contemporary issues.
Consent & Paternalism
Consent is a direct extension of autonomy. It means patients have the right to make informed decisions about their care, based on a clear understanding of their options, risks, and outcomes.
Paternalism, on the other hand, occurs when a physician makes decisions for a patient “for their own good,” even if it overrides the patient’s preferences. While this can conflict with autonomy, it may be justified in certain situations, such as emergencies where a patient is unconscious and unable to provide consent.
Understanding the balance between respecting autonomy and stepping in when necessary is essential, especially in high-pressure or time-sensitive scenarios.
Confidentiality
Confidentiality is the obligation to keep a patient’s personal and medical information private. Outside of HIPAA’s legal protections, maintaining confidentiality helps to build trust, as patients are more likely to be honest and open when they know their information is protected.
In practice, this means not sharing patient details without permission, except in specific situations where there is a legal or ethical duty to do so. An example may be when a patient poses a risk to themselves or others.
Veracity
Veracity refers to honesty in communication with patients. Physicians are expected to tell the truth about diagnoses, treatment options, and prognoses, even when the information is difficult to deliver.
This principle ties closely to autonomy, because patients can only make informed decisions if they are given accurate and complete information. In real-world situations, veracity requires both honesty and compassion. It’s not just what you say, but how you say it.
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Why These Matter When Applying to Med School
Understanding bioethical principles is an important part of how admissions committees evaluate you. You’ll be expected to apply moral theory principles in interviews, situational judgment tests like Casper and PREview, your personal statement, and secondary essays.
Schools aren’t looking for perfect answers. They’re looking for how you think, how you balance competing values, and whether you can approach complex situations with maturity and empathy.
Strong applicants are able to describe how clinical ethics are applied in practice. That might mean reflecting on a clinical experience to explain how you respected a patient’s autonomy, or working through a scenario in which beneficence and justice were in tension.
If you can clearly and thoughtfully apply bioethical reasoning, you’re showing that you’re ready to think like a future physician.
Examples of Biomedical Ethics Cases
Biomedical ethical reasoning comes up in real clinical situations every day. Below are examples of how these principles play out in practice, and the kinds of scenarios and ethical issues you may also be asked to analyze in interviews and assessments.
Surgery Refusal
Principle(s): Autonomy
A patient refuses a life-saving surgery due to personal or religious beliefs. Even when the physician believes the treatment would clearly benefit the patient, a respect for autonomy requires respecting the patient’s informed decision. As long as the patient has decision-making capacity and understands the consequences, their choice stands.
In-Vitro Fertilization (IVF) for “Healthier” Offspring
Principle(s): Justice
As IVF technology advances, some individuals use it to select for “healthier” offspring. This raises concerns about fairness and access. It also raises questions about how selecting certain traits may impact society. One concern is that it could reinforce inequality, giving those with more financial resources an advantage.
Euthanasia
Principle(s): Autonomy, Non-maleficence
Euthanasia presents a direct conflict between respecting a patient’s autonomy and the physician’s duty to do no harm. While the American Medical Association (AMA) generally opposes euthanasia, states like Oregon have passed the Death With Dignity Act, allowing terminally ill adults to voluntarily request a prescription for lethal drugs.
Mandatory Vaccination
Principle(s): Autonomy, Beneficence, Justice
Mandatory vaccination policies highlight the tension between individual choice and public health ethics. While autonomy supports a person’s right to refuse treatment, beneficence and justice support protecting the broader population and ensuring health risks are fairly distributed. These cases often require balancing personal freedom with collective responsibility.
AI in Healthcare
Principle(s): Autonomy, Justice, Non-maleficence
As artificial intelligence (AI) becomes more integrated into healthcare, new ethical questions emerge around bias, accountability, and decision-making. Patients may not fully understand how AI contributes to their care, raising concerns about informed consent. At the same time, biased algorithms could reinforce healthcare disparities, challenging both justice and non-maleficence.
Organ Transplantation & Donation
Principle(s): Beneficence, Justice
There are far more patients in need of organ transplants than available organs, making allocation a major ethical challenge. Physicians and systems must decide how to distribute organs fairly while maximizing positive outcomes. This requires balancing equity with effectiveness, often under emotionally and ethically intense circumstances.
Gene Editing for Genetic Diseases
Principle(s): Autonomy, Non-Maleficence, Justice
Gene editing technologies offer the potential to prevent serious diseases, but they also carry risks and unknown long-term consequences. Research involving human beings must follow strict ethical standards, including safety, informed consent, and scientific validity.
Guidelines for ethical research involving human subjects were established by the National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research. The Belmont Report of 1979 provided a framework that continues to guide ethical decisions in genetic engineering and research today.
There are also concerns about who has access to these treatments and whether they could worsen existing health disparities. The ethical challenge is balancing innovation with caution and fairness in both clinical care and research.
Suicide Attempts
Principle(s): Autonomy, Beneficence, Non-maleficence, Justice
Managing responses to suicide attempts requires being an ethical decision-maker. Physicians must balance respect for the patient’s autonomy with the duty to provide beneficial care, avoid harm, and account for inequities that may have contributed to the attempt.
Involuntary hospitalization and psychiatric treatment could be seen as violating autonomy or justice, but could be justified under the principles of beneficence or non-maleficence.
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FAQs
Tom Beauchamp and James Childress are ethicists who developed the framework of the four principles of biomedical ethics: autonomy, beneficence, non-maleficence, and justice.
Their work, Principles of Biomedical Ethics (Oxford University Press), the first edition of which was published in 1979, is foundational in medical education. It provides a utilitarian approach to ethical decision-making in medical practice.
Bioethical principles guide decisions around genetic engineering by balancing innovation with responsibility. Autonomy requires informed consent from patients undergoing genetic interventions. Beneficence supports the use of these technologies to prevent or treat disease.
Non-maleficence focuses on minimizing unintended harm and long-term risks. Justice raises important questions related to research ethics about access, affordability, and whether these technologies could widen existing health disparities.
Healthcare ethics committees use bioethical principles to evaluate difficult or disputed ethical problems in clinical medicine. Examples include end-of-life decisions, conflicts between patients and providers, or questions about resource allocation.
They don’t make decisions for the care team; instead, they provide guidance by weighing the four fundamental principles to help reach a course of action grounded in medical ethics.
Boost Your Chances of Medical School Acceptance
As part of your medical school applications and interviews, you may be asked to discuss and analyze situations using biomedical ethical principles. The key isn’t just reciting these principles, but showing your own moral reasoning and character.
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Sahil Mehta MD
Dr. Mehta is the founder of MedSchoolCoach and has guided thousands of successful medical school applicants. He is also a practicing physician in Boston where he specializes in vascular and interventional radiology.
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