Risk factor

Score

61-74 years

2

≥75 years

3

BMI >25 kg/m2

1

Pregnancy or postpartum

1

History of unexplained or recurrent miscarriage/stillborn infant

1

Positive factor V Leiden mutation

3

Positive prothrombin 20210A mutation

3

Positive lupus anticoagulant

3

Positive anticardiolipin antibodies

3

Positive anti–beta2-GPI antibodies

3

HIT

3

Other congenital or acquired thrombophilia

3

Varicose veins of lower limb

1

History of VTE

3

Family history of VTE

3

Patient confined to bed (>72 h)

2

Limb immobilized in plaster cast

2

Arthroscopic surgery

2

Major surgery (>45 min)

2

Laparoscopic surgery (>45 min)

2

Elective arthroplasty

5

Hip, pelvis, or leg fracture

5

Serious lung disease, including pneumonia (<1 month)

1

Abnormal pulmonary function

1

Acute myocardial infarction

1

Onset or exacerbation of heart failure (<1 month)

1

History of inflammatory bowel disease

1

Central venous access

2

Malignancy

2

Stroke (<1 month)

5

Acute spinal cord injury (<1 month)

5

Interpretation of risk level:

Score 0: Very low risk

Score 1-2: Low risk

Score 3-4: Moderate risk

Score ≥5: High risk