CD40LG and antiphospholipid syndrome: However, the child was screened at 1 and 3 years of age; this always resulted in a negative for antiphospholipid syndrome screening (respectively, anti-beta2-glycoprotein IgG < 6.4 U/mL in both occasions; IgG 1.2 U/mL and 2 U/mL; anti-cardiolipin IgG 3.1 U/mL and 5 U/mL; IgM 1.7 U/mL and 3 U/mL; normal up to 20 U/mL; LAC dRVVT 0.9 and 0.86; Silica 1.06 and 0.94; normal up to 1.2).