Cold Spring Harbor Laboratory
Your Genes, Your Health: Down Syndrome
Key facts about Down Syndrome are available on this page--just roll over the icons. For more detailed information, use the left navigation to explore causes, diagnosis, treatment, and more.
American Association for Clinical Chemistry
Lab Tests Online: Down Syndrome
This informative site explains what this congenital condition is, and delves into the different types of testing to diagnose this chromosome defect.