By Wai Win
Autonomy, the right to determine what happens to one’s own body, is a core principle of medical ethics. While adults routinely exercise this right, children have historically been excluded from participation in medical decision-making. The landmark decision in Gillick v West Norfolk and Wisbech AHA marked a pivotal shift. The House of Lords held that children under 18 may lawfully consent to medical treatment without parental involvement if they possess sufficient understanding and intelligence to comprehend the nature and consequences of the proposed intervention.
In the judgement, Lord Scarman rejected the fixed age thresholds, cautioning that the law must remain “sensitive to human development and social changes”. Gillick signified a transition away from parental authority towards recognising minors as autonomous rightsholders with decision-making capacities. This principle was later affirmed by the High Court of Australia in Marion’s Case, which established that parental authority diminishes progressively as a child develops sufficient maturity and understanding to make decisions independently.
Conceptual uncertainty and judicial limits
Despite its enduring influence, Gillick remains conceptually vague. Scholars have raised concerns that the test’s defining phrase — ‘sufficient understanding and intelligence’— has not been clearly articulated. Courts rarely specify the factors underpinning the findings of ‘competence’, leaving medical practitioners, who are the primary assessors, to interpret the test for themselves with little guidance. In practice, they often rely on personal judgement, perceived risk of the proposed treatment and institutional norms, resulting in inconsistent application.
Although the doctrine originated in the context of contraceptive advice, its principles now extend to a broad spectrum of medical decisions, without clear guidance on how the threshold for ‘capacity’ should adapt across contexts. Bart, Hall and Gillam observed that, in addition to providing no structured methods for assessing capacity to decide, Gillick also imposes no positive duty to involve minors who may be capable in decision-making. In effect, adolescent participation becomes “permissible rather than obligatory”, undermining the very autonomy that the doctrine seeks to protect.
Courts have also placed limits on the practical application of Gillick, with judicial findings of ‘competence’ varying with the perceived level of medical risk involved. In refusal-of-treatment cases or cases involving ‘special medical procedures’ that are irreversible and carry serious risk, Courts have frequently overridden the decisions of minors assessed as having decision-making capacity on welfare grounds. These rulings reflect the judiciary’s ongoing paternalism towards adolescent autonomy, a tendency that undermines both the coherence and consistency of Gillick standards.
Fragmented legal landscape
Despite the limited guidance provided in the case, statutory regulations of adolescents’ capacity to consent remain sparse across Australia, with only two jurisdictions having legislation that expressly addresses the issue. South Australia’s Consent to Medical Treatment and Palliative Care Act 1995 permits children under the age of 16 to consent to medical treatment if two medical practitioners certify that they understand the nature and effect of the treatment and that it is in their best interest. Tasmania’s Guardianship and Administration Act 1995 similarly recognises advance care directives from minors, subject to a doctor’s confirmation of their maturity.
While some states, such as Queensland, have issued practical tools to guide assessments of minors’ decision-making ability, they remain optional and confined to specific contexts. Without a consistent national framework, the doctrine offers little more than piecemeal guidance, leaving the scope of Gillick uncertain and its protection uneven across jurisdictions. Embedding clear obligations, as done in legislation, similar to those in South Australia, could help resolve this ambiguity and ensure that young patients are consistently informed of and assessed for their decision-making capacity.
Clinical inconsistencies
Empirical research confirms the inconsistency in how clinicians assess decision-making capacity. A Queensland study of general practitioners found significant variations in how Gillick principles are applied, with many relying on extra-legal factors such as age, diagnoses, perceived risk associated with treatment or even gender, rather than the criteria of ‘intelligence’ or ‘maturity’ as set out by the case.
Similar uncertainties have been observed across other clinical settings. Martin, Then and Boyle’s research found that practitioners in emergency medicine frequently reported confusion over key terminologies like “capacity” and “maturity”, with many reaching different conclusions on identical facts. Likewise, Spriggs observed that researchers and ethics committee members assessing minors’ consent to participate in research also expressed frustration over the lack of consistent criteria, often defaulting to age-based judgements. These findings indicate that, in the absence of clear and standardised assessment tools, Gillick fails to empower young people in decision-making. Instead, it operates through subjective and inconsistent judgments shaped by the personal values and discretion of individual assessors rather than by an objective legal standard.
Consequences of uncertainty
Consequences of this uncertainty are grave. Overreliance on the individual assessor’s discretion in determining when and how Gillick ‘competence’ is established has produced inconsistent outcomes and denied decision-making rights to minors who may, in fact, be capable. The subjectivity diminished both the reliability of the doctrine and its capacity to protect the autonomy it was intended to uphold. In the face of this ambiguity, scholars such as Zimmerman have critiqued Gillick as an “overly complex and sometimes counterproductive tool” that has drifted from its original purpose of empowering the evolving autonomy of young patients.
Towards a rights-based reform
Experts have argued for a shift away from reliance on the assessor’s discretion to a rights-based framework, which recognised children as autonomous rights-holders with legally enforceable interests. This would be consistent with the United Nations Convention on the Rights of the Child, which requires that domestic law respect the child’s evolving capacities (Art 5) and guarantee each capable child the right to express their views on matters affecting them (Art 12). In line with Art 12, any such reform should impose a positive duty on governments and professionals to create age-appropriate and accessible procedures to facilitate effective participation.
There has also been support for abandoning the presumption that children lack decision-making capacity until proven otherwise. To reflect this, the rights-based model of Gillick framework should adopt an approach that presumes capacity and places responsibility on adults to provide disclosure, information, and support to help minors exercise their right to participate in decisions about their healthcare and mandate the consistent assessment of all young patients. Once a child’s decision-making ability is established, external interference with a child’s decision should be limited, irrespective of the level of risk involved. True respect for autonomy requires recognising a ‘competent’ child’s right to decide, even when that decision carries serious consequences, consistent with the respect accorded in the case of adults.
Embedding these principles in legislation would not only clarify practitioners’ duties but also transform adolescent consent from a matter of discretion into one of enforceable rights.
Most importantly, it would uphold the central purpose of Gillick: to empower young people to participate meaningfully in decisions about their health and to ensure that such a right is genuinely protected in the law.
*In this article, the term ‘competence’ appears in quotation marks or is replaced with decision-making capacity to reflect contemporary rights-based language consistent with the UN Convention on the Rights of Persons with Disabilities.*
