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This study aimed to explore the relationship between recurrent reproductive failure (RRF) and blocking antibody (BA) and lymphocytes, to explore the difference of immune status between recurrent spontaneous abortion (RSA) and recurrent implantation failure (RIF) patients. We undertook a retrospective analysis of BA and lymphocyte subsets detected by flow cytometry in 720 RRF patients (411 RSA and 309 RIF patients) who were treated at Shanxi Maternal and Child Health Hospital from April 2015 to October 2019. The BA negative rate of RRF patients was 81.80%, which was significantly higher than that of normal women (23.46%) ( p  &lt; 0.05). There was no significant difference in BA negative rates between RSA and RIF patients. Compared with the normal value, the percentage of CD3 +  T lymphocytes and CD3 + CD4 +  T lymphocytes in RRF patients were 71.1% (65.9–76.0) and 36.8% (32.5–41.9) respectively, which were significantly lower than the normal value ( p  &lt; 0.05). The percentage of B cells in RSA patients [11.0 (8.8–13.9)] was significantly lower than that in RIF patients [11.9 (9.4–14.8)]. The occurrence of RRF is related to the lack of BA and the change of lymphoid subsets. There are some differences in immune status between RSA and RIF patients.

Analysis of blocking antibodies and lymphocyte subsets in patients with recurrent reproductive failure