In patients with SLE without thrombocytopenia, platelet count was correlated with leukocyte, neutrophil, and lymphocyte counts, as well as C3 and C4 levels, but not with hemoglobin levels, a positive direct Coombs' test, or the SLEDAI 2000 score (Table 1). The gene discussed is C3; the disease is systemic lupus erythematosus.