University of Washington
University of Washington: Osteoporosis
Detailed information about osteoporosis, including diagnosis, prevention and treatment. While the some of the medical language of the site can be difficult, the use of charts and diagrams make the information more accessible.
American Association for Clinical Chemistry
Lab Tests Online: Osteoporosis
This concise but informative site examines the different types of osteoporosis, tests to determine if osteoporosis is present, and treatment options.