Preparation of the recipient for donor embryo transfer:
The embryos are transferred when the endometrium is deemed ready through ultrasound examination. Preliminary tests done on the embryo recipient are similar to those of the oocyte recipient. Hysteroscopy might be necessary for the clinicians to view the endometrium in detail. Endometrial thickness is monitored through vaginal ultrasonography, and to achieve the best pregnancy rates, the endometrium should be at least 8mm. If the recipient menstruates regularly, the endometrium is prepared during a natural cycle or after suppressing menstruation using hormones. The recipient continues taking estrogen and Progesterone after the embryo transfer. If she does become pregnant, she will continue taking the hormones; if the pregnancy test is negative, she stops using the drugs, and even if she is menopausal, she will have menstrual bleeding within the week.