I've been here for my husband's APS (he also has polycythemia), but now I have a question for myself. On Oct 27th, I fainted & ended up in the ER. Blood tests were done, but after 15 - 30 minutes, the lab had to get all new blood because my blood had clotted in the tubes. On Oct 27th, I went back to the ER because of still having problems with fainting & I was an having extremely bad, non-stop headache. A lab tech went to draw blood, but it clotted in in the first tube almost immediately. When the needle was pulled out, I didn't bleed at all. She drew blood from another spot & I guess it was okay.
My question is, does anyone know what would cause blood to clot in the test tube & should I be concerned about this?