CD40LG and systemic lupus erythematosus: The laboratory criteria include the presence of these three antibodies: anticardiolipin (aCL), immunoglobulin G (IgG), and/or IgM antibodies by enzyme-linked immunosorbent assay (ELISA), anti-beta2 glycoprotein I antibodies (anti-β2GPI) IgG and/or IgM ELISA, and the lupus anticoagulant (LA) antibody.