Antiphospholipid Syndrom or Lupus Anticcoagulant.

Lupus anticoagulant (also known as lupus antibody, LA, or lupus inhibitors) is a medical phenomenon where autoantibodies bind to phospholipids and proteins associated with the cell membrane. Since interactions between the cell membrane and clotting factors are necessary for proper functioning of the coagulation cascade, the lupus anticoagulant can interfere with blood clotting as well as in-vitro tests of clotting function. Paradoxically, lupus anticoagulants are also risk factors for thrombosis.(more...)

Other sites.

http://www.nlm.nih.gov/medlineplus/ency/article/000547.htm

http://arthritis-symptom.com/lupus/lupus-anticoagulant.htm

http://en.wikipedia.org/wiki/Antiphospholipid_syndrome

http://www.medicalnewstoday.com/articles/181700.php

This site has about 50 articles regarding APS, with many about its effects on children:

http://www.antiphospholipid.net/clin.html

Thank you Sharon!!! This is a great site.