Progesterone elevation on the day of human chorionic gonadotropin administration is not the only factor determining outcomes of in vitro fertilization

Progesterone concentration on the day of hCG administration is not the only factor determining the clinical pregnancy and live-birth rates. Fresh embryos from women should be frozen with extremely high progesterone concentrations. Each patient's general condition and the capacity for frozen-thawed embryo transfer should be considered before implantation.