Is there a way to know if you have a blood clot before A DVT sets in?

Uhhh, a blot clot is a DVT... deep vein thrombosis. To avoid this, simply MOVE....post surgery, one would be on heparin or lovenox then coumadin...but one should always move... simply, blood flows up the legs by the pressure in the vessels but more importantly by the muscles squeezing the blood up..no movement means no squeezing means stagnant flow means clot....look for swollen, painful legs..not a good sign.