Master Massachusetts adopts the patient-oriented, materiality standard for informed consent and an objective test for causation. with this comprehensive case brief.
Harnish v. Children's Hospital Medical Center is the Massachusetts Supreme Judicial Court's landmark decision aligning the Commonwealth with the modern, patient-centered doctrine of informed consent. Rejecting a physician-centered, professional custom standard for disclosure, the court held that a physician's duty turns on what information a reasonable patient would deem material to deciding whether to undergo a proposed treatment or procedure. In doing so, the court explicitly embraced the influential reasoning of Canterbury v. Spence, clarifying both the content of the duty to disclose and the plaintiff's burden to prove causation.
For law students, Harnish is essential because it reframes informed consent as protecting patient autonomy rather than physician prerogative. It also provides a precise, exam-ready structure for analyzing informed consent claims: duty (materiality), breach (nondisclosure of material risks and alternatives), causation (objective reasonable-patient test), damages (injury resulting from the undisclosed risk), and recognized exceptions (emergency, incompetence, therapeutic privilege). The case thus stands at the intersection of tort doctrine, medical ethics, and evidence.
387 Mass. 152, 439 N.E.2d 240 (Mass. 1982)
The plaintiff, Ms. Harnish, underwent surgery at Children's Hospital Medical Center to address a serious condition in her neck region. According to her evidence, the physician did not disclose certain significant risks associated with the procedure—specifically, potential injury to nerves affecting tongue function and related sensory or motor deficits—nor did he adequately discuss non-surgical alternatives or the comparative risks and benefits of different options. After the operation, Harnish experienced complications consistent with the undisclosed risks (including impairments affecting the tongue and related functions). She brought suit alleging negligence based on lack of informed consent. At trial, the judge instructed the jury that the physician's disclosure obligations were governed by what the medical profession customarily disclosed (a physician-oriented standard) and suggested that expert testimony on professional custom was required to establish the scope of the duty. The jury returned a verdict for the defendants. Harnish appealed, arguing that the trial court applied the wrong legal standard and that the jury should have been instructed on a patient-oriented, materiality standard for disclosure.
Does a physician's duty to disclose information for informed consent in Massachusetts depend on the professional standard of disclosure (what physicians customarily reveal) or on a patient-oriented standard of materiality (what a reasonable patient would consider important), and how should causation be assessed in such claims?
In Massachusetts, the duty to disclose in informed consent cases is measured by what information a reasonable patient in the physician's position would consider material to making a decision about treatment. A risk (or alternative) is material if a reasonable patient, in what the physician knows or should know to be the patient's position, would be likely to attach significance to it in deciding whether to undergo the proposed therapy. The physician must disclose material risks, benefits, and reasonable alternatives, subject to recognized exceptions (e.g., emergencies, incompetence, and a narrow therapeutic privilege). To prevail, the plaintiff must prove: (1) the physician failed to disclose a material risk or alternative; (2) the undisclosed risk materialized and caused injury; and (3) causation under an objective standard—i.e., that a reasonable person in the patient's position would have declined or chosen differently if properly informed. Expert testimony is generally required to establish the existence, nature, and probability of medical risks and alternatives, but not to establish the legal standard or the materiality determination, which is for the factfinder.
The Supreme Judicial Court adopted the patient-oriented, materiality standard for informed consent and an objective reasonable-patient test for causation. Because the trial court instructed the jury under a physician-centered professional disclosure standard, the judgment for the defendants was reversed and the case remanded for a new trial under the proper legal framework.
The court grounded its analysis in the principle of patient autonomy: medical decision-making ultimately belongs to the patient, not the profession. A disclosure standard based on professional custom risks perpetuating medical paternalism by allowing physicians—rather than patients—to define what information is important. By contrast, a materiality standard, focused on the informational needs of a reasonable patient, best vindicates the right of self-determination and aligns with the broader tort goal of reasonable care under the circumstances. Relying on Canterbury v. Spence, the court defined material risks as those a reasonable patient would likely consider significant when deciding among medical options. The court emphasized that disclosure includes not only the risks of the proposed treatment, but also its benefits and reasonable alternatives, as well as the risks of foregoing treatment, to the extent those matters are material. The court recognized narrow exceptions: (1) emergencies that preclude disclosure; (2) patient incapacity; and (3) therapeutic privilege, applicable only when disclosure itself poses a serious threat to the patient's well-being and must be carefully circumscribed. On proof, the court clarified that while jurors can evaluate materiality without professional custom evidence, expert medical testimony is generally needed to establish the medical facts—the nature of the condition, available alternatives, and the frequency and severity of pertinent risks—because such matters are beyond common knowledge. As to causation, the court adopted an objective test: whether a reasonable person in the patient's position would have declined the procedure or chosen differently if properly informed. This standard avoids the reliability issues inherent in a purely subjective, hindsight statement by the plaintiff and provides a predictable, administrable rule. Applying these principles, the court found the trial judge's physician-centered instruction erroneous and ordered a new trial with proper patient-centered instructions.
Harnish is the leading Massachusetts case on informed consent. It cements the patient-oriented, materiality standard for disclosure; clarifies that the action sounds in negligence; adopts an objective reasonable-patient test for causation; and explains the role of expert testimony. Doctrinally, it aligns Massachusetts with modern tort theory, prioritizing patient autonomy over professional custom. Practically, it provides a clear checklist for evaluating informed consent claims and informs model jury instructions across the state.
Before Harnish, some courts measured disclosure by what physicians customarily revealed. Harnish rejects that physician-centered standard and adopts a patient-oriented, materiality standard: a physician must disclose information a reasonable patient would consider important to deciding whether to proceed, including material risks, benefits, and alternatives.
The plaintiff must show: (1) the physician failed to disclose a material risk or reasonable alternative; (2) the undisclosed risk materialized and caused injury; and (3) causation under an objective standard—that a reasonable person in the patient's position would have declined or chosen differently if fully informed. Damages are limited to the harm resulting from the undisclosed risk.
Yes, generally. While jurors determine materiality without reference to professional custom, expert medical testimony is usually required to establish the medical facts—what risks exist, their probability and severity, the available alternatives, and the consequences of foregoing treatment. Expert testimony is not required to define the legal duty or the materiality standard itself.
Harnish adopts an objective reasonable-patient test: would a reasonable person in the patient's position, if properly informed of material risks and alternatives, likely have refused or chosen differently? This avoids the reliability concerns of purely subjective, hindsight testimony and provides a consistent standard for juries.
The court acknowledges limited exceptions: emergencies that make disclosure impracticable, patient incompetence (requiring surrogate decision-making), and a narrow therapeutic privilege where disclosure would pose a serious threat to the patient's well-being. These exceptions are to be applied cautiously and do not swallow the general rule favoring disclosure.
Negligence. Harnish frames failure to obtain informed consent as a negligent nondisclosure claim governed by a reasonableness standard, not as an intentional tort of battery. The focus is on breach of a duty to disclose material information and the causal link to the patient's injury.
Harnish v. Children's Hospital Medical Center marks a decisive shift to patient autonomy in Massachusetts tort law. By embracing a materiality-based disclosure duty and an objective test for causation, the court creates a principled, administrable framework that aligns medical malpractice doctrine with modern ethical norms and the core tort concept of reasonable care.
For students and practitioners, Harnish offers an analytical roadmap: identify the material risks and alternatives (with expert support), assess the adequacy of disclosure under a reasonable-patient lens, apply the objective causation test, and consider recognized exceptions. It remains a foundational case for understanding and litigating informed consent claims.
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