Uterine fluid human decidua-associated protein 200 and implantation after embryo transfer.

Uterine fluid samples from 109 patients undergoing in-vitro fertilization and embryo transfer were obtained so as to examine the relationship between the uterine fluid concentration of human decidua-associated protein (hDP) 200 and the implantation rate. The sampling was performed on the day of embryo transfer with a Wallace catheter, used for the testing of cervical patency before embryo replacement. The implantation rate, as well as the pregnancy rate, demonstrated a significantly positive correlation with the concentration of hDP 200 in the uterine fluid, measured just before embryo transfer. These results indicate that hDP 200, identified as a rheumatoid factor secreted by the endometrium, may be involved in the implantation process.