Clinical feature
 
 Score
Active cancer (treatment ongoing or within previous 6 months or palliative)
1
 
Paralysis, paresis, or recent plaster immobilisation of the legs
1
 
Recently bedridden for more than 3 days or major surgery within 4 weeks
1
Localised tenderness along the distribution of the deep venous system
1
Entire leg swollen
1
Calf swelling by more than 3 cm compared with the asymptomatic leg (measured 10 cm below the tibial tuberosity)
1
Pitting oedema (greater in the symptomatic leg)
1
Collateral superficial veins (non-varicose)
1
Alternative diagnosis as likely or wider than that of deep vein thrombosis
-2

Low probability 0 or less, moderate probability 1-2, high probability 3 or more

DVT

BMJ http://bmj.com/cgi/content-nw/full/326/7400/1180/TBL1: