Risk factor

Patients with factor

Personal history of VTE

6

Known thrombophilia

2

Reduced target limb mobility

16

Combined OCP or Oestrogen based HRT

7

Superficial vein thrombosis in < 12 weeks

9

Body Mass Index > 30 kg/m²

19

Past history of malignancy

8

Ulcerative colitis

3

Crohn's disease

1