Which regulation governs the practice of medical laboratory professionals in Ontario?

The Regulated Health Professions Act, 1991 is the correct answer because it provides the framework for the regulation of health professions in Ontario, including medical laboratory professionals. This act establishes the regulatory bodies for various health professions and sets out requirements for registration, standards of practice, and the conduct expected of regulated health professionals.

The act aims to protect the public by ensuring that practitioners are qualified and competent in their respective fields. It outlines the processes for establishing and maintaining professional standards, which are critical for assuring the safety and quality of healthcare services provided to the public.

In contrast, although the Health Professions Act and the Medical Laboratory Act may relate to healthcare or laboratory practices, they do not specifically encompass the comprehensive regulations governing the practice of medical laboratory professionals. The Occupational Health Act focuses on workplace safety and health issues, which, while important, do not directly regulate the professional practice of medical laboratory professionals. Therefore, the Regulated Health Professions Act, 1991 is the foundational regulation for medical laboratory professionals in Ontario.