Yahoo! Groups: Leiden Factor V Support
- Message board and chat room for people diagnosed with the Factor V Leiden genetic disorder.
- http://health.groups.yahoo.com/group/leidenfactorvsupport/

Factor Five Leiden Support
- Support for sufferers of the Factor Five Leiden blood clotting disorder, an inherited blood condition discovered in 1995. History, glossary, and meeting information (Oregon).
- http://www.factorfiveleidensupport.org/

University of Illinois Patient Resources
- Description of factor V Leiden, its risks and treatment options. Also discusses the impact of other conditions on this disease.
- http://www-admin.med.uiuc.edu/hematology/PtFacV2.htm

Living with Factor V Leiden
- Factor V Leiden is the most common hereditary blood coagulation disorder in the United States. It is present in 5% of the American population.
- http://www.fvleiden.org/