Most docs give some sort of blood thinner before and after surgery like Heprin. Some
Even send you home with Lovenox for
Two weeks, plus the compression stockings and wraps they put on you in the hospital PLUS you will be up and walking which gets your blood flowing and keeps those nasty clots away. I've had DVTs and both times no PE and its usually not hereditary. There is a thing called factor 5, which is hereditary, but I think your dad would have been tested for that and you would have known. When all these posts say get up and walk after surgery, it's not just for gas, it's to prevent clots too!