Fig. 4
From: Uterine angle changes during the in vitro fertilization treatment cycle
Schedule of frozen-thawed embryo transfer. (a) Menstrual period: second or third day of menstruation; (b) Ovulatory period: the day before the start of progesterone preparations in hormone replacement cycles or day before ovulation in natural cycles; (c) Implantation period: the day of embryo transfer. Ultrasonography was performed at all three time points. Serum hormone measurements (estradiol and progesterone) were obtained during the ovulatory (b) and implantation (c) periods.
