Registered Medical Assistant (RMA) - American Association of Medical Assistants, American Medical Technologist, National Center for Competency Testing, National Association for Healthcare Professionals, American Registry of Medical Assistants Inc, Healthcare Professionals Registry of the United States, or American Allied Health - within 3 months - Required or. Certified Medical Assistant (CMA) - American Association of Medical Assistants, American Medical Technologist, National Center for Competency Testing or National Association for Healthcare Professionals - within 3 months - Required or.