I have it. I carry only one gene. I didn't know it until I developed a blog clot after the birth of my second daughter. I got my clot in the upper arm so it went undecteded for 5 days. Ug. I'm just glad they finally figured out what was going on and got me on Heparin immediately and then they switched me to Warfarin which I continued for 6 months after that.

My doctor said if I were to get pregnant again that I would have to be on one of those anticoagulants for the pregnancy. I don't plan to have another baby so I haven't looked into that part of it much. I know I can no longer be on any hormones (birth control, etc) and there are other things I have to keep in mind as well throughout my life. It's just kind of strange.

Sounds like you found a good article monarogirl. At least when you know you have it, you can take the proper precautions and your doctors can keep a careful eye on you.