Active cancer (treatment within 6/12 or palliation) 2) Paralysis, paresis, immobilization of lower extremity 3) Localized tenderness along the distribution of deep veins 4) Entire leg swollen 5) Unilateral calf swelling of greater than 3 cm below tibial tuberosity 6) Unilateral pitting edema 7) Collateral superficial veins 8) Alternative diagnosis as likely as or more likely than DVT – Score 1 for each yes answer except number 8 which is scored as 2.  Score of 3 or more (high risk of DVT 75%), score of 1 -2 points (moderate risk 17%), score less than 1 (low risk of DVT 3%). (Well’s et.al. 1997)