Serum supplement in human in vitro fertilization and embryo development.

The effects of maternal preovulatory serum and human fetal cord serum supplement in culture medium in human in vitro fertilization and embryo development were compared in 208 cases over an 8-month period when there were no significant changes in other variables. A significantly higher pregnancy rate was observed in the fetal cord serum group despite no significant difference being found in fertilization and embryo cleavage rates. This suggests a difference in the health of the embryo cultured in different serum supplements.