Embryo transfer of IVF is the last step of IVF assisted pregnancy cycle. The surgical process of retrieving healthy blastocysts diagnosed as PGD/PGS genetic diseases from IVF laboratory and implanting them into women's uterus. Pregnancy-assisting doctors need to put the sterilized speculum into women's vagina to make it enter the uterus, and complete the transfer operation with the help of ultrasonic instruments.
Embryo transfer PK blastocyst transfer
In China, IVF is transplanted on the third day after fertilized eggs are formed, while IVF hospital will culture fertilized eggs to form blastocysts on the fifth day, then diagnose and screen PGD/PGS genetic diseases, and select healthy embryos for transplantation.
embryo transplantation
Compared with blastocysts, the artificial culture of embryos is relatively simple. In China, on the premise of taking out the same number of follicles in a test tube cycle, more embryos can be cultivated than blastocysts, but a large number does not mean that high-quality blastocysts can survive to the fifth day.
Many transplants in most hospitals are multiple births, and good embryos and bad embryos are transplanted at the same time. On the one hand, healthy embryos may not be implanted, and there may be a risk of multiple births, which requires abortion. Individual hospitals can cultivate blastocysts, but without the support of PGS and PGD technology, the quality of embryos is unknown.
Blastocyst transplantation
The activity of blastocyst is much higher than that of embryo, which is composed of single-digit to double-digit cells, and blastocyst is composed of triple-digit cells. The survival rate of blastocyst transplantation is much higher than that of embryo. IVF technology can diagnose and screen genes through PGD/PGS, eliminate unhealthy blastocysts and ensure the health of the baby after birth. The shape of blastocyst is larger than that of embryo, the structure will be more stable and the implantation rate will be higher. However, in the past two days, the equipment of IVF hospital and the technical requirements of doctors are very strict.
So blastocyst transfer is better than embryo. The blastocysts transplanted on the fifth day need better medical equipment, higher medical technology and medical experience, so the pregnancy rate of IVF will be higher.