Which of the following is NOT a term defined in RA 5527?

The choice of Registered Nurse as not being defined in RA 5527 is correct because the act specifically pertains to the profession of medical technology and does not encompass the definitions or roles of nurses. RA 5527, known as the Medical Technology Act of 1969, focuses on the regulation and practice of medical technologists and associated professionals, such as medical laboratory technicians and pathologists.

In contrast, terms like Pathologist, Medical Technologist, and Medical Laboratory Technician are all explicitly defined within the act. These definitions serve to clarify the scope of practice, qualifications, and responsibilities specific to these professions under the law. The inclusion of these terms is essential for establishing standards and regulations for medical technology in the Philippines, emphasizing the act's focus on this specific field rather than the broader healthcare profession represented by nursing.