CD163 and systemic lupus erythematosus: Regarding urinary sCD163 tested in SLE patients (Fig. 1D), the ratio with creatinuria (sCD163/creatinuria) was highly effective to discriminate LN-A (n = 50) both from LN-IR (n = 67; AUC = 0.990 and p < 10−4) and from non-LN (n = 80; AUC = 0.972 and p < 10−4).