The two most commonly cited exceptions to informed consent in medical practice are the emergency exception and therapeutic privilege. These are the situations where a physician can legally proceed with treatment without going through the standard process of explaining risks, benefits, and alternatives to the patient and obtaining their agreement. A third exception, patient waiver, is also recognized, but the emergency and therapeutic privilege exceptions are the two that arise most frequently in medical ethics and law courses because they involve the physician making the call to bypass consent.
The Emergency Exception
The emergency exception applies when a patient faces a life-threatening condition, cannot participate in decision-making (because they’re unconscious or otherwise incapacitated), and no surrogate decision-maker is available. In these situations, treatment can begin without prior consent. The logic is straightforward: waiting to obtain consent would result in serious harm or death, so the law presumes the patient would want life-saving treatment.
All three conditions generally need to be present for this exception to hold. The situation must be urgent enough that delaying care creates real danger. The patient must be unable to communicate or make decisions. And there must be no family member or legal representative available to consent on the patient’s behalf. If a conscious patient refuses treatment, the emergency exception does not override that refusal, even in a critical situation.
The American Medical Association’s Code of Medical Ethics reinforces this standard: physicians may initiate treatment without prior informed consent when a decision must be made urgently, the patient cannot participate, and no surrogate is available. Once the emergency has passed, the physician is expected to inform the patient or their surrogate as soon as possible and obtain consent for any ongoing treatment. The consent isn’t permanently waived. It’s deferred until communication becomes possible.
State laws vary in how they define the specifics. Some states spell out exactly who qualifies as a surrogate decision-maker, while others rely on common law traditions. Hospitals typically have internal policies that guide how emergency consent exceptions are documented, but the core principle is consistent across jurisdictions.
Therapeutic Privilege
Therapeutic privilege is the more controversial of the two exceptions. It allows a physician to withhold certain information from a patient when disclosing it would cause serious and immediate psychological harm. The idea is that, in rare cases, the act of informing a patient could be so destabilizing that it compromises their ability to make rational decisions or even worsens their physical condition.
The threshold for invoking therapeutic privilege is high. A physician can’t simply decide a patient would be upset by bad news. The standard requires that disclosure would pose a genuine psychological threat serious enough to be medically harmful. Courts have generally supported this exception only when full disclosure would make rational decision-making impossible or cause direct psychological damage to the patient.
One real-world example: a physician might delay telling a critically ill patient that a close family member has died if the shock of that news could destabilize their recovery. In published case discussions, non-disclosure of a spouse’s death was justified under therapeutic privilege because the information could psychologically harm the patient and jeopardize their physical health.
The AMA’s Code of Medical Ethics frames it this way: physicians may withhold information when disclosing it would constitute a serious psychological threat, one so severe as to be medically contraindicated. This is not a blanket permission to hide diagnoses or sugarcoat prognoses. It applies narrowly, and physicians who invoke it carry the burden of justifying that decision.
Critics of therapeutic privilege argue it can be misused to justify paternalistic medicine, where doctors decide what patients can “handle” rather than respecting their autonomy. For this reason, it is applied rarely and scrutinized heavily when challenged in court.
How These Differ From Patient Waiver
A third recognized exception is patient waiver, which works differently from the other two. In this case, a competent patient voluntarily gives up their right to receive detailed information before consenting. They might tell their physician, “I trust your judgment, just do what you think is best,” without wanting to hear about risks and alternatives. Some patients designate a trusted family member to receive the information and make decisions on their behalf, which is common in certain cultural contexts.
The key distinction is who initiates the bypass. With emergency and therapeutic privilege, the physician decides to proceed without full consent. With waiver, the patient makes that choice. Because the patient retains control, waiver is generally considered less ethically fraught, though the physician still has a responsibility to ensure the patient understands they have the right to be informed if they change their mind.
Why These Two Are Singled Out
When textbooks, exam questions, or legal references ask about “the two exceptions,” they almost always mean emergency and therapeutic privilege. These are the exceptions where the physician, not the patient, decides that informed consent will not be obtained in the usual way. They represent the legal system’s recognition that rigid adherence to consent procedures could, in specific circumstances, cause more harm than it prevents.
The landmark case Canterbury v. Spence, decided in 1972, helped refine these exceptions in American law. The court acknowledged that physicians are not required to disclose information when doing so would make a patient so upset that rational decision-making becomes impossible, or when disclosure would cause direct psychological harm. This case established much of the modern legal framework around what physicians owe patients in terms of information, and where the boundaries of that obligation lie.
Both exceptions share a common requirement: documentation. When a physician bypasses informed consent for any reason, they are expected to record what circumstances justified the exception, what actions were taken, and when normal consent processes were resumed. This documentation protects the patient’s rights and provides a legal record if the decision is later questioned.