Mental Capacity Act (MCA): Primary legislation governing decision-making capacity and proxy decision-making for medical treatment. Includes provisions for Lasting Powers of Attorney (LPA) for personal welfare and sets framework for determining mental capacity.

Advanced Medical Directive Act (AMD): Legislation governing advance medical directives in Singapore, particularly focusing on end-of-life treatment decisions and the formal requirements for making valid medical directives.

Medical Registration Act: Defines and regulates the scope of medical practice in Singapore, establishing what types of medical treatments can be legally authorized and by whom.

Personal Data Protection Act (PDPA): Legislation governing the collection, use, disclosure, and care of personal medical information, including consent requirements and privacy protection measures.

Human Biomedical Research Act: Regulates human biomedical research and clinical trials, including consent requirements and protections for research participants.

Healthcare Services Act: Establishes regulatory framework for healthcare services and sets standards for medical treatment delivery in Singapore.

Singapore Medical Council Ethical Code: Professional guidelines establishing ethical standards and best practices for medical practitioners in Singapore.

Ministry of Health Directives: Regulatory guidelines and directives issued by Singapore's Ministry of Health governing various aspects of healthcare delivery and medical treatment.