S E P T E M B E R 2 0 1 7 • O U T PA T I E N TS U R G E R Y. N E T • 9 5
o Malignancy (present or previous)
o Laparoscopic surgery expected to last longer than 45 minutes
o Patient confined to bed for longer than 72 hours
o Immobilizing plaster cast for less than 1 month
o Central venous access
o Major surgery expected to last longer than 45 minutes
Add 3 points for each statement that applies
o Age 75 years or older
o History of DVT/PE
o Positive factor V leiden (mutation of blood clotting factor)
o Elevated serum homocysteine
o Heparin-induced thrombocytopenia (HIT)(Do not use heparin or
any low-molecular weight heparin)
o Elevated anticardiolipin antibodies
o Family history of thrombosis*
* The most frequently missed risk factor
o Positive prothrombin 20210A
o Positive lupus anticoagulant
o Other congenital or acquired thrombophilia
If yes, type: ____________________________
Add 5 points for each statement
that applies now or within the past month
o History of stroke
o Elective major lower extremity arthroplasty
o Hip, pelvis or leg fracture
o Acute spinal cord injury
o Multiple trauma
