With the patient in a relaxed state, the doctor uses a catheter to deposit a predetermined number of embryos in the uterus, gaining access through the vagina. The correct placement of the embryos near the top of the endometrial cavity is important so ultrasound technology is used for guidance. The procedure is a very delicate one, involving no unnecessary manipulation of the embryos. Even with the most careful embryo transfer, the success of the procedure is chiefly dependent on the genetic quality of the eggs.
Complications of an Embryo Transfer
Fresh Embryos vs. Frozen Embryos
Frozen embryos may be used when the first embryo transfer has been unsuccessful or for another potential pregnancy for the same couple later on. Another option is that the frozen embryos may be donated to another couple or single woman with infertility problems. Because the embryos are encased during freezing in a liquid know as a cryoprotectant, they are visible for about a decade. Even so, not all frozen embryo survive the thawing process, so more embryos are usually thawed than will be transferred.