Optimal lead follicle size for human chorionic gonadotropin trigger in clomiphene citrate and intrauterine insemination cycles: an analysis of 1,676 treatment cycles.

Objective: To identify the optimal lead follicle size for hCG trigger in clomiphene citrate (CC)-intrauterine insemination (IUI) cycles.

Design: Retrospective cohort study.

Setting: University-affiliated center.

Fresh or Frozen Embryo Transfer in In Vitro Fertilization: An Update.

The past decade has witnessed a rapid increase in the number of frozen-thawed embryo transfer (FET) cycles. Several factors have contributed to the increase in FET cycles, including improvement in culture media, vitrification, and an increase in preimplantation genetic testing of embryos. However, the accelerated trend in FET cycles also suggests that FET may be preferred over fresh embryo transfer.