Checkout a helpful medical assistant blog: Formal training in medical assisting, while generally preferred, is not always required. Some medical assistants are trained on the job, although this practice is less common than in the past. Applicants usually need a high school diploma or the equivalent. Recommended high school courses include mathematics, health, biology, typing, bookkeeping, computers, and office skills. Volunteer experience in the health care field also is helpful. Medical assistants who are trained on the job usually spend their first few months attending training sessions and working closely with more experienced workers. Some States allow medical assistants to perform more advanced procedures, such as giving injections, after passing a test or taking a course.
http://symondblog.blogspot.com/2008/12/online-classes-for-medical-assistants.html
