The mature minor doctrine is a rule of law found in the United States and Canada accepting that an unemancipated minor patient may possess the maturity to choose or reject a particular health care treatment, sometimes without the knowledge or agreement of parents, and should be permitted to do so.^[1] It is now generally considered a form of patients rights; formerly, the mature minor rule was largely seen as protecting health care providers from criminal and civil claims by parents of minors at least 15.^[2]

Jurisdictions may codify an age of medical consent, accept the judgment of licensed providers regarding an individual minor, or accept a formal court decision following a request that a patient be designated a mature minor, or may rely on some combination. For example, patients at least 16 may be assumed to be mature minors for this purpose,^[3] patients aged 13 to 15 may be designated so by licensed providers, and pre-teen patients may be so-designated after evaluation by an agency or court. The mature minor doctrine is sometimes connected with enforcing confidentiality of minor patients from their parents.^[4]

In the United States, a typical statute lists: "Who may consent [or withhold consent for] surgical or medical treatment or procedures."

"...Any unemancipated minor of sufficient intelligence to understand and appreciate the consequences of the proposed surgical or medical treatment or procedures, for himself."^[5][6]

By definition, a "mature minor" has been found to have the capacity for decisional autonomy, or the right to make decisions including whether to undergo risky medical but potentially life-saving medical decisions alone, without parental approval.^[7] By contrast, "medical emancipation" formally releases children from some parental involvement requirements but does not necessarily grant that decision making to children themselves. Pursuant to statute, several jurisdictions grant medical emancipation to a minor who has become pregnant or requires sexual-health services, thereby permitting medical treatment without parental consent and, often, confidentiality from parents. A limited guardianship may be appointed to make medical decisions for the medically emancipated minor and the minor may not be permitted to refuse or even choose treatment.^[8]

One significant early U.S. case, Smith v. Seibly, 72 Wn.2d 16, 431 P.2d 719 (1967), before the Washington Supreme Court, establishes precedent on the mature minor doctrine. The plaintiff, Albert G. Smith, an 18-year-old married father, was suffering from myasthenia gravis, a progressive disease. Because of this, Smith expressed concern that his wife might become burdened in caring for him, for their existing child and possibly for additional children. On March 9, 1961, while still 18, Smith requested a vasectomy. His doctor required written consent, which Smith provided, and the surgery was performed. Later, after reaching Washington's statutory age of majority, then 21, the doctor was sued by Smith, who now claimed that he had been a minor and thus unable to grant surgical or medical consent. The Court rejected Smith's argument: "Thus, age, intelligence, maturity, training, experience, economic independence or lack thereof, general conduct as an adult and freedom from the control of parents are all factors to be considered in such a case [involving consent to surgery]."

The court further quoted another recently decided case, Grannum v. Berard, 70 Wn.2d 304, 307, 422 P.2d 812 (1967): "The mental capacity necessary to consent to a surgical operation is a question of fact to be determined from the circumstances of each individual case." The court explicitly stated that a minor may grant surgical consent even without formal emancipation.

Especially since the 1970s, older pediatric patients sought to make autonomous decisions regarding their own treatment, and sometimes sued successfully to do so.^[9] The decades of accumulated evidence tended to demonstrate that children are capable of participating in medical decision-making in a meaningful way;^[10][11] and legal and medical communities have demonstrated an increasing willingness to formally affirm decisions made by young people, even regarding life and death.^[12]

Religious beliefs have repeatedly influenced a patient's decision to choose treatment or not. In a case in 1989 in Illinois, a 17-year-old female Jehovah's Witness was permitted to refuse necessary life saving treatments.^[13]

In 1990, the United States Congress passed the Patient Self-Determination Act; even though key provisions apply only to patients over age 18,^[14] the legislation advanced patient involvement in decision-making. The West Virginia Supreme Court, in Belcher v. Charleston Area Medical Center (1992) defined a "mature minor" exception to parental consent, according consideration to seven factors to be weighed regarding such a minor: age, ability, experience, education, exhibited judgment, conduct, and appreciation of relevant risks and consequences.^[15][16]

The 2000s and 2010s experienced a number of outbreaks of vaccine-preventable diseases, such as the 2019–2020 measles outbreaks, which were fueled in part by vaccine hesitancy. This prompted minors to seek vaccinations over objections from their parents.^[17][18] Beginning in the 2020s during the COVID-19 pandemic, minors also began seeking out the COVID-19 vaccine over the objections of their vaccine-hesitant parents.^[19] This has led to proposals and bills allowing minor to consent to be administered with any approved vaccine.^[20]

• Emancipation of minors
• Marion's Case (Australia)
• Gillick competence (UK)
• Age of consent
• Age of majority