FASLG and deep vein thrombosis: The updated classification criteria assume the presence of at least one clinical criteria (thrombosis or morbidity in pregnancy) and a laboratory positive result (lupus anticoagulant [LAC], anticardiolipin [aCL], or anti-β-2-glycoprotein I [aβ2GPI] antibodies).6Definitive classification criteria are established when at least one clinical and one laboratory positive result are present.6, 11, 12Laboratory tests should be confirmed at least 12 weeks after first determination to minimize the risk of making a diagnosis based on transient antiphospholipid (aPL) antibodies.6