C4A and Thrombocytopenia: Logistic regression analysis confirmed the association with thrombocytopenia (p < 0.0001, Exp(B) 0.39, SE 0.75, 95%CI 0.09–0.171), anti-dsDNA/anti-Sm positivity (p = 0.01, Exp(B) 0.05, SE 0.91, 95%CI 0.01–0.326), low C4 levels (p = 0.001, Exp(B) 0.05, SE 0.91, 95%CI 0.01–0.326), joint involvement (p = 0.01, Exp(B) 0.227, SE 0.58, 95%CI 0.07–0.71).