American Association of Medical Assistants
Centers for Disease Control & Prevention (CDC) excellent source for diseases & conditions, data & statistics
Lab Tests Online produced by the American Association of Clinical Chemistry
Medline Plus health topics, drugs & supplements, videos & cool tools, Merriam-Webster Medical Dictionary
Medscape Reference drugs, diseases & procedures (must set up free login)
Merck Manual Consumer Version
Merck Manual Professional Version
National Center for Complementary & Integrative Health (NCCIH)
Occupational Outlook Handbook Medical Assistant career information