Thanks, Ren! That explains a lot. I knew there was a connection between the lupus anticoagulant and blood clots, but I couldn't figure out whether it was because of the lupus, or something else.
Currently I'm off the warfarin - I just had a doppler earlier this year, and my leg was clear of clots. My doctor recommended aspirin for me, and he wanted to put me on Plavix. I resisted, because Plavix is just so dang expensive.