Table 1: VTE risk factor categories in this Worcester score, note that patients with a history of cancer or inflammatory conditions like IBD or rheumatoid arthritis are automatically classified as high risk.

High risk factors

score

Previous VTE

2

Known thrombophilia

2

Limb immobility

2

Moderate risk factors

score

Obesity (BMI > 30)

1

Hormone therapy

1

Superficial vein thrombosis

1

Other high risk factors

2

*Cancer, inflammatory arthritis or inflammatory bowel disease.