F2 and systemic lupus erythematosus: investigated Chinese patients with primary and secondary APS, describing aPS/PT as a superior predictor of thrombosis compared to LA.46 Notably, the point estimate for VTE in Swedish SLE patients was higher for double positivity for aPS/PT together with anti-β2GPI antibodies than for conventional triple positivity further supporting a pivotal role of aPS/PT antibodies.