Objetive: To investigate the changes of serum levels of Th2 Cytokines in patients with recurrent spontaneous abortion. Methods: Serum levels of IL 6, IL 10 were measured by enzyme linked immunosorbant assay (ELISA) in 69 cases of recurrent spontaneous abortion(RSA). RSA were randomly divided into two groups: early RSA and delayed RSA. 20 normal pregnant and 20 nonpregnant women were control groups. Results: The serum level of IL 6 in RSA group was obviously higher than that of nor...