What Is Informed Consent? A Plain Guide for Patients and Families

A few years ago I sat beside my uncle in a curtained bay on a surgical floor. He was a retired machinist, sharp as a tack, and he could explain the tolerances on an engine part better than anyone I knew. A nurse handed him a clipboard with three dense pages and a pen. “Just sign at the bottom so we can get you in,” she said kindly. She was busy. He was nervous. He signed, and on paper that signature counted as his informed consent.

Later, as we waited, he turned to me and asked, “What exactly are they doing to my knee?” He had agreed to something on paper, yet nobody had told him, in words he could hold onto, what it was.

That moment is the reason I do the work I do. I have spent most of my career rewriting hospital handouts, consent documents, and discharge instructions so that ordinary people can actually use them. And the single topic I return to more than any other is informed consent, because it sits right at the point where a patient’s trust, a clinician’s skill, and a piece of paper all meet.

I wrote this guide for patients, parents, adult children caring for aging parents, and anyone who has ever held a form while someone said, “Sign here.” I want you to finish reading with a clear sense of what informed consent is, what rights you have, and how to make sure the process works for you rather than around you.

What Informed Consent Actually Means

At its simplest, informed consent means you understand a test, treatment, or procedure well enough to decide whether you want it, and then you freely say yes or no.

The American Medical Association puts it plainly in its Code of Medical Ethics Opinion 2.1.1: consent to medical treatment is fundamental in both ethics and law, and patients have the right to receive information and ask questions about recommended treatments so they can make good decisions about their care.

Notice the two halves of the phrase. “Informed” means you received the information that matters and you understood it. “Consent” means you agreed voluntarily, without pressure, while you were capable of making the decision. If either half is missing, what you have is not really informed consent. It is just a signature.

I often explain it to families this way. Imagine a contractor wants to tear out a wall in your house. A good contractor tells you why the wall needs to come down, what could go wrong, how much it will cost, what your other options are, and what happens if you leave it alone. Then you decide. Your body deserves at least that level of respect, and in medicine the law actually requires it.

A Short History: How Patients Earned the Right to Informed Consent

It helps to know that nobody handed informed consent to patients as a courtesy. People who suffered harm fought for it, often in courtrooms.

In 1914, a New York woman named Mary Schloendorff agreed to an examination under ether but did not agree to an operation. While she was unconscious, surgeons removed a tumor anyway. In the court’s opinion, Judge Benjamin Cardozo wrote a line that medical schools still quote today: “Every human being of adult years and sound mind has a right to determine what shall be done with his own body.”

The actual phrase “informed consent” came later. It first appeared in a 1957 California case, Salgo v. Leland Stanford Jr. University Board of Trustees, where the court recognized that simply agreeing to something is not enough if no one explained the risks to you.

Then came a landmark case in 1972. A 19 year old clerk named Jerry Canterbury had back surgery and ended up partly paralyzed after a fall in the hospital. His surgeon later testified that he had mentioned possible weakness but had not mentioned the risk of paralysis. In Canterbury v. Spence, the federal appeals court in Washington, D.C. said the measure of what a doctor must disclose should rest on what a reasonable patient would want to know, not just on what other doctors typically say. Mr. Canterbury did not win damages in the end, but his case changed how doctors across the country think about disclosure.

I share this history because it reminds patients of something important. You are not being difficult when you ask questions. You are exercising a right that other people paid a high price to secure.

The Core Pieces of a Real Informed Consent Conversation

Hospitals and clinics use different forms, and state laws vary. But the heart of informed consent is consistent. According to the AMA guidance and the clinical overview in StatPearls on the NCBI Bookshelf, a complete conversation should cover these points:

• Your diagnosis or condition. What is going on, in plain words, and how sure the team is about it.
• The recommended treatment or procedure. What the team will actually do, who will do it, and roughly how long it takes.
• The expected benefits. What the treatment aims to achieve and how likely that outcome is for someone like you.
• The risks and burdens. Both the common and less serious side effects, and the rare but serious ones. This also includes recovery time, pain, cost, and the effect on your daily life.
• The alternatives. Other reasonable options, including a different procedure, medication, watchful waiting, or doing nothing at all. The AMA specifically mentions the risks and benefits of forgoing treatment, which many patients do not realize they can ask about.
• The clinician’s recommendation and reasoning. You have a right to hear what your doctor thinks you should do and why.
• Time and space for your questions. And an honest effort to make sure you understood the answers.

The decision must also be voluntary. That means no one should rush you, threaten you, or make you feel you will lose access to care if you hesitate.

When You Need Informed Consent and When You Do Not

Not every moment of care needs a formal consent discussion. When you hold out your arm for a blood pressure cuff, you give what clinicians call implied consent. Your actions show you agree.

Clinicians generally need formal informed consent for surgery, procedures that involve anesthesia or sedation, invasive tests, blood transfusions, many cancer treatments, some imaging that uses contrast dye, and participation in research. The MedlinePlus patient guide for adults from the National Library of Medicine walks through when it applies and what your role is.

There are a few recognized exceptions. StatPearls describes them as situations where the patient cannot decide and no surrogate can step in, a true life threatening emergency where waiting would cause serious harm, and cases where a patient knowingly chooses to waive the discussion. The AMA adds that in an emergency, treatment may begin without prior consent, but the physician should inform the patient or surrogate at the earliest opportunity and obtain consent for any ongoing treatment.

So if your father arrives unconscious in an emergency room after a car accident, the team will not wait to find a pen before stopping the bleeding. But once he is stable, or once you arrive as his decision maker, the conversation should begin.

Why the Form Is Not Informed Consent

This is the part I most want readers to remember. The paper you sign is evidence that a conversation happened. It is not the conversation itself.

The Joint Commission, the body that accredits most American hospitals, made this point so strongly that it titled one of its Quick Safety bulletins “Informed Consent: More Than Getting a Signature.” The bulletin warns clinicians not to assume patients understand the medical terms in a consent form and states directly that a form alone is not sufficient for informed consent. It also cites a study that found four basic elements (the nature of the procedure, risks, benefits, and alternatives) appeared together on consent forms only 26.4 percent of the time.

Read that number again. In roughly three out of four forms studied, something essential was missing from the paper. That is why the spoken conversation matters so much, and why you should never treat signing as the end of your questions.

In my work reviewing consent documents, I see the same problems over and over. Sentences that run forty words long. Latin phrases. Bare percentages for risks, with no context. Phrases like “including but not limited to” that tell a frightened reader nothing. When I rewrite these forms, the goal is not to hide anything. It is to make the important things visible.

Who Can Give Informed Consent: Capacity, Surrogates, and Children

To give informed consent, a person must have decision making capacity. In practical terms, that means they can understand the information, weigh it against their own values, reach a choice, and communicate that choice.

Capacity is specific to the decision and the moment. Someone with early dementia may be fully able to decide about a flu shot but not about a complex heart operation. Someone who is usually sharp may temporarily lose capacity because of a high fever, heavy sedation, or a severe infection. Capacity can also return.

When an adult cannot decide, a surrogate steps in. That might be a health care agent named in an advance directive, a guardian the court appoints, or a family member that state law recognizes. A good surrogate does not decide based on what they would want for themselves. They decide based on what the patient would have wanted, using everything they know about that person’s values.

Children are a special case. StatPearls notes that minors generally cannot give legal informed consent, so parents or guardians give what the law calls “informed permission” instead. Ethics guidance still encourages clinicians to seek the child’s own agreement, called assent, in a way that fits their age. Rules for teenagers, emancipated minors, and certain types of care differ from state to state, so it is worth asking your child’s care team how the law works where you live.

Language, Culture, and Health Literacy in Informed Consent

Here is something that surprises many people. Health literacy is not the same as intelligence or education. A university professor can struggle to understand a consent form after hearing she has cancer. Fear, pain, medication, and unfamiliar vocabulary all reduce how much anyone can absorb in the moment.

If English is not your first language, you have the right to a qualified medical interpreter. The Agency for Healthcare Research and Quality (AHRQ) advises clinicians to arrange an interpreter for the entire consent discussion, not just the signature at the end. Please do not rely on a child, a cousin, or a bilingual friend to interpret a serious medical conversation. They may soften bad news, skip words they do not know, or feel enormous pressure. A trained interpreter protects both you and them.

Culture matters too. The Joint Commission notes that in some cultures, a family or community group makes decisions rather than one individual, and that asking for a signature can feel like a sign of mistrust. If that describes your family, say so. A thoughtful care team can adapt the process while still respecting the patient’s own voice.

The Teach Back Method: A Tool You Can Use Yourself

Of all the tools I teach, this one is the simplest and the most powerful.

The AHRQ Health Literacy Universal Precautions Toolkit describes teach back as a way of checking understanding by asking patients to explain, in their own words, what they need to know or do. The same toolkit points out that the National Quality Forum, the Joint Commission, and the Leapfrog Group all recommend using teach back during informed consent discussions as a safety practice.

AHRQ also makes a point I love sharing with families: questions like “Do you understand?” or “Does that make sense?” are not teach back questions, because patients tend to say yes whether they understand or not. A 2022 review in Patient Safety in Surgery described teach back as adding a closed loop to the consent conversation, so that information does not just flow in one direction. That two-way exchange is the heart of real patient engagement.

You do not have to wait for a clinician to use it. You can start it yourself. Try saying something like this:

“Let me repeat this back so I know I have it right. You are going to remove my gallbladder through small cuts in my belly. The main risks are bleeding, infection, and a small chance of injury to the bile duct. If I do nothing, the pain attacks will probably keep coming back. Did I miss anything?”

If you get something wrong, that is not a failure. It is the whole point. It gives your doctor a chance to explain again in a different way. AHRQ even recommends breaking information into small chunks and checking understanding along the way rather than all at the end.

Questions to Ask Before You Sign an Informed Consent Form

I keep a version of this list folded in my own wallet. Feel free to copy it, print it, or save it on your phone.

• What do you call this procedure, in everyday words?
• Why do you recommend it for me specifically?
• What will happen before, during, and after?
• What are the most common side effects, and what are the most serious ones?
• How likely is it that this will help me?
• What other options do I have, including waiting or doing nothing?
• What happens if I say no?
• Who will actually perform the procedure, and will trainees take part?
• How long is recovery, and when can I return to work, driving, or caring for my family?
• What will this cost, and will my insurance cover it?
• Can I take the form home, or have more time to think?
• Who can I call if I have questions afterward?

Bring a trusted person or a patient advocate with you if you can. Ask them to take notes. Two sets of ears catch far more than one, especially when you are anxious or in pain.

Saying No, Changing Your Mind, and Informed Refusal

Informed consent includes the right to refuse. A competent adult can decline a treatment even if the doctor strongly recommends it, and even if others think the choice is unwise.

When you refuse, the same principles apply in reverse. Your clinician should explain what could happen if you decline, so that your refusal rests on the same full picture an agreement would. Many organizations call this “informed refusal” and will document it in your record. That is not a punishment. It shows that the team explained the risks, and that you made the call.

You can also change your mind. Signing a consent form does not lock you in. Until the procedure begins, you can withdraw your consent. If you feel uncertain on the morning of surgery, tell the nurse or surgeon. It is far better to pause and talk than to go ahead with doubts you never voiced.

Informed Consent in Research and Telehealth

If a research team invites you to join a clinical trial, the consent process is usually more detailed. Research consent must explain the purpose of the study, what participation involves, any foreseeable risks, how the team will protect your information, and the fact that taking part is voluntary. You can leave a study at any time without losing your regular care.

Telehealth has brought new wrinkles. AHRQ has published practical guidance on how to obtain consent for telehealth, recommending that clinics send forms ahead of time so patients can read them in advance, offer to read the form aloud, and use teach back to confirm understanding of points like the option of an office visit instead, the cost, and the patient’s ability to withdraw consent. AHRQ also notes that clinics can collect a signature through the patient portal or by mail. If a clinic asks you to agree to a video visit, you have every right to know who can see your information and what happens if the connection fails. The same questions apply if your doctor asks you to use a home monitoring device that sends readings to the clinic.

A Note for Family Members and Caregivers

If you are the person sitting in the chair beside the bed, your role is bigger than you might think.

Start by writing down questions ahead of time, asking the team to repeat explanations, and gently noticing when your loved one looks confused or overwhelmed. Feel free to ask everyone to slow down. It is also fair to request that a conversation happen when your parent is most alert, perhaps in the morning rather than late at night after pain medication.

If you are acting as a surrogate, keep returning to one question: what would this person choose if they could speak for themselves right now? That question is often painful, but it keeps the decision centered where it belongs.

And if your loved one can still participate, even partially, include them. People with mild cognitive impairment, hearing loss, low vision, or limited English can often take part in decisions when someone presents the information clearly and patiently. Removing those barriers to accessible care is part of the care team’s job. Leaving them out entirely, even with good intentions, takes away something that belongs to them.

Frequently Asked Questions About Informed Consent

What is informed consent in simple terms?

It is your right to understand a medical test or treatment, including its risks, benefits, and alternatives, before you freely decide whether to accept it. The MedlinePlus patient guide offers a short patient friendly overview.

Is signing a consent form the same as giving informed consent?

No. The form documents that a conversation took place. The Joint Commission states clearly in its Quick Safety bulletin that a consent form alone is not sufficient.

Can I withdraw my consent after I sign?

Yes. You can change your mind at any point before the procedure starts. Tell your care team directly, and ask them to note your decision in your record. The AMA Code of Medical Ethics guidance emphasizes the patient’s right to make and communicate decisions about their own care.

Who gives consent if the patient cannot decide?

A surrogate decision maker, such as a health care agent named in an advance directive, a legal guardian, or a family member that state law recognizes. The StatPearls clinical overview explains how surrogates and guardians fit into the process.

Do I have a right to an interpreter during the consent process?

In most U.S. health care settings, yes. AHRQ recommends using a qualified interpreter for the whole consent discussion. Its telehealth consent guidance is a good example of how this should work in practice.

What is the teach back method?

It is a simple way to confirm understanding by explaining back, in your own words, what you heard. Learn more in the AHRQ teach back tool.

Can a doctor treat me without consent in an emergency?

Yes, when you are unable to decide, no surrogate is available, and delaying would cause serious harm. Afterward, the team should inform you or your surrogate as soon as possible, as the AMA ethics opinion explains.

Final Thoughts

My uncle’s knee surgery went well, as it happens. But I have never forgotten the look on his face when he realized he had agreed to something he did not understand. He was not careless. The system around him simply moved faster than his questions could.

Informed consent exists to slow that system down just enough for you to catch up. It is your chance to understand, to ask, to weigh what matters to you, and then to decide. A good clinician welcomes that. Every good care team builds time for it, because it shapes the whole patient experience. And a good patient, which is to say any patient, has every right to insist on it.

So the next time someone hands you a clipboard and a pen, take a breath. Ask your questions. Repeat back what you heard. Bring someone you trust. And sign only when the word “informed” is true.

References

• American Medical Association. Code of Medical Ethics Opinion 2.1.1. AMA Council on Ethical and Judicial Affairs.
• Shah P, Thornton I, Turrin D, Kopitnik N, Hipskind JE. StatPearls clinical overview. StatPearls, NCBI Bookshelf. Treasure Island (FL): StatPearls Publishing; National Library of Medicine.
• The Joint Commission. Quick Safety Issue 21: More Than Getting a Signature. Updated April 2022.
• Agency for Healthcare Research and Quality. Use the Teach Back Method: Tool 5, Health Literacy Universal Precautions Toolkit.
• Agency for Healthcare Research and Quality. How to Obtain Consent for Telehealth.
• MedlinePlus, U.S. National Library of Medicine. Patient Instructions for Adults.
• Seely KD, Higgs JA, Nigh A. Utilizing the Teach Back Method to Improve Surgical Shared Decision Making: A Review. Patient Safety in Surgery, 2022.
• U.S. Court of Appeals for the District of Columbia Circuit. Canterbury v. Spence, 464 F.2d 772 (1972). LSU Law Center case archive.