Introduction
The principle that a medical professional must obtain a patient's valid consent before providing treatment is a fundamental tenet of medical law in developed common law jurisdictions. This principle protects patient autonomy and the right to bodily integrity. For consent to be valid, the patient must have the capacity to make the decision and be sufficiently informed. This essay will compare the legal frameworks governing medical consent and capacity in England and Wales with those in Australia. It will show that while both jurisdictions share a common law heritage emphasising patient self-determination, they have developed distinct statutory and judicial approaches. The essay will argue that England has adopted a comprehensive, codified approach through its single piece of legislation, whereas Australia's framework is a combination of robust common law principles, particularly regarding information disclosure, and a more fragmented, state-based system for managing incapacity.
The Common Law Foundation of Consent
Both English and Australian law are built upon the same foundational common law principle: any intentional touching of a person without their consent is a battery. As Cardozo J stated in the influential US case Schloendorff v Society of New York Hospital (1914), "Every human being of adult years and sound mind has a right to determine what shall be done with his own body". This principle has been consistently upheld in both England and Australia. In England, the case of Chatterton v Gerson [1981] established that for consent to be valid and act as a defence to battery, the patient must be informed in broad terms of the nature of the procedure. Similarly, Australian common law robustly defends the right to self-determination, viewing unwanted medical treatment as a trespass to the person (Marion's Case, 1992). This shared heritage means that the basic requirement for consent to treatment is almost identical in both jurisdictions: the consent must be voluntary, given by a person with capacity, and relate to the specific treatment proposed.
Defining and Assessing Capacity
A central element of valid consent is the capacity of the patient to make the decision. Here, the approaches in England and Australia, while leading to similar outcomes, show a difference between a codified and a common law-based system.
In England and Wales, the law on capacity was clarified and codified by the Mental Capacity Act 2005 (MCA 2005). Section 1 of the MCA 2005 sets out five key principles, including a presumption of capacity (s.1(2)) and the right for individuals to make 'unwise' decisions (s.1(4)). The test for a lack of capacity is found in sections 2 and 3. A person is unable to make a decision if they cannot understand, retain, use, or weigh the relevant information, or communicate their decision (s.3(1)). This functional test must be caused by an impairment or disturbance in the functioning of the mind or brain (s.2(1)). The MCA 2005 therefore provides a single, clear statutory framework for assessing capacity across England and Wales.
In contrast, Australia does not have a single, overarching federal statute equivalent to the MCA 2005. Capacity is generally assessed according to common law principles, which are broadly similar to the English test but have not been codified in the same way. The test often cited in Australian courts is similar to that expressed in the English case of Re C (Adult: Refusal of Treatment) [1994], which requires the patient to be able to comprehend and retain the information, believe it, and weigh it in the balance to arrive at a choice. While each Australian state and territory has its own guardianship and medical treatment legislation that defines capacity for the purposes of that Act, the common law test remains highly influential and provides the underlying standard (Queensland v B, 2018). This results in a less unified system than in England, with the precise legal test potentially varying depending on the specific legislative context within each state.
The Standard of Information Disclosure for Consent
A key area of divergence between the two jurisdictions has historically been the standard of information disclosure required from doctors. For consent to be real, a patient must be given sufficient information about the risks, benefits, and alternatives of a proposed treatment.
For many years, the English position was governed by the Bolam test, which held that a doctor's conduct should be judged against the standard of a responsible body of medical opinion (Bolam v Friern Hospital Management Committee [1957]). This meant that the amount of information given to a patient was determined by what other doctors considered appropriate, a distinctly paternalistic and doctor-centric approach. This was finally overturned by the Supreme Court in Montgomery v Lanarkshire Health Board [2015]. The court established a new test, stating that a doctor has a duty to take reasonable care to ensure the patient is aware of any material risks involved in a recommended treatment, and of any reasonable alternative treatments. A risk is material if a reasonable person in the patient's position would be likely to attach significance to it, or if the doctor is or should reasonably be aware that this particular patient would be likely to attach significance to it.
Interestingly, Australia adopted this patient-centric approach over two decades earlier. In the landmark High Court of Australia case of Rogers v Whitaker (1992), the court explicitly rejected the Bolam test in the context of providing advice and information. It held that the standard of care is not determined solely by medical practice but by the court, and that a doctor has a duty to warn a patient of a material risk. The court defined a material risk in terms very similar to those later used in Montgomery, focusing on what the particular patient would want to know. Therefore, in the journey towards greater patient autonomy in information disclosure, Australian common law was significantly ahead of the law in England.
Treatment of Incapacitated Adults
When an adult lacks the capacity to consent to treatment, both legal systems provide a framework for decisions to be made on their behalf, but the mechanisms differ. In England, the MCA 2005 provides a comprehensive 'best interests' test. Section 4 of the Act lists factors that must be considered when determining what is in an incapacitated person's best interests. This includes considering the person's past and present wishes and feelings, the beliefs and values that would be likely to influence their decision if they had capacity, and consulting with those close to the person. For serious medical treatment, an application may need to be made to the Court of Protection.
Australia's approach is structured differently due to its federal system. Each state and territory has its own guardianship legislation which establishes a specialist tribunal (e.g., the NSW Civil and Administrative Tribunal or the Victorian Civil and Administrative Tribunal). These tribunals have the power to appoint a substitute decision-maker, such as a guardian or an administrator, who is given the authority to make decisions, including consenting to medical treatment, on behalf of the person who lacks capacity. The legislation in each state provides principles to guide these substitute decision-makers, which are broadly equivalent to the 'best interests' principle in England, though terminology varies. This tribunal-based system provides a decentralised, specialist mechanism for substitute decision-making, in contrast to England's court-based approach under a single statutory scheme.
Conclusion
In conclusion, the legal frameworks for medical consent and capacity in England and Australia share common origins but have evolved along different paths. Both jurisdictions firmly uphold the principle of patient autonomy, requiring consent for medical treatment. However, England has moved towards a codified, unified system through the Mental Capacity Act 2005, which provides a single statutory test for capacity and a clear 'best interests' framework for those who lack it. Australia, by contrast, maintains a more fragmented system, with a patchwork of state and territory legislation governing guardianship and substitute decision-making. Despite this, Australian common law, particularly through the seminal case of Rogers v Whitaker, established a progressive, patient-centric standard for information disclosure long before English law reached the same position with Montgomery. The comparison reveals two systems grappling with the same fundamental ethical and legal questions, but arriving at different structural and, in some areas, doctrinal solutions. While England's framework may offer greater national consistency, the Australian common law has shown itself to be a powerful vehicle for advancing patient rights.
References
Aintree University Hospitals NHS Foundation Trust v James [2013] UKSC 67.
Bolam v Friern Hospital Management Committee [1957] 1 WLR 582.
Chatterton v Gerson [1981] QB 432.
Montgomery v Lanarkshire Health Board [2015] UKSC 11.
Queensland (State of) v B [2018] QSC 233.
Re C (Adult: Refusal of Treatment) [1994] 1 WLR 290.
Rogers v Whitaker (1992) 175 CLR 479.
Schloendorff v Society of New York Hospital, 211 N.Y. 125, 105 N.E. 92 (1914).
Secretary, Department of Health and Community Services v JWB and SMB (Marion's Case) (1992) 175 CLR 218.
Mental Capacity Act 2005.
