“…The incidence of thrombophilia is also increased in patients with SVT [ 10,13,[15][16][17] . It may be useful to evaluate patients with SVT who do not have varicose veins and have one other risk factor for SVT for markers of thrombophilia including protein S de fi ciency, protein C de fi ciency, anticardiolipin antibodies, beta2 glycoprotein, factor V Leiden, prothrombin mutation, antithrombin de fi ciency, lupus anticoagulant, methylene tetrahydrofolate reductase de fi ciency, and fasting serum homocysteine [ 10,13,16,[18][19][20] .…”