I have Factor V Leidens. I found out when I had a heart attack at 26. Very rare for heart attack. I am getting sleeved June 8th. I get my protime checked often and will be going on a Lovenox Bridge for surgery. I would see about getting into an appointment with a Hematologist. Either before or after.
Be aware of any family history of blood clots. My surgeon asked if anyone in my family has had a problem with thrombosis, and I recalled that two siblings have had blood clots after commercial flights. It was enough for my doc to order an extra blood test to check for a common inherited trait called factor V leiden, and sure enough I've got it. It's pretty common among European Americans, 3-8% of the population carry it, but it means that they'll take extra steps to be sure I don't have a pulmonary embolism after surgery.
Always better to know before than to deal with complications later.