Keywords: ACL, anticardiolipin antibody; APS, antiphospholipid syndrome; DIF, direct immunofluorescent; LA, lupus anticoagulant; aPL, antiphospholipid antibodies; anti-β2GPI, anti–β2-glycoprotein antibody; anticoagulation; antiphospholipid syndrome; complement C3; purpura fulminans.