CD33 and hydrops fetalis: We found that CD64 on CD14+ CD16− monocyte [OR (95% CI): 1.04 (1.01–1.06)], Gr MDSC Activated [OR (95% CI): 1.02 (1.00–1.05)], HLA DR on CD33− HLA DR+ [OR (95% CI): 1.02 (1.00–1.04)] were risk factors for HF.