What are the types of Embryo Transfer?
There are essentially six types of embryo transfers based on various factors. These include – fresh, frozen, cleavage (day 3), a blastocyst (day 5), single and multiple transfers.
Fresh and frozen types of embryo transfers refer to the mode of transfer. In the case of fresh embryo transfer, the eggs would have been cultured for a period of 1-2 days after fertilization. These are then ready for transfer and deposited into the womb. A frozen embryo transfer is when unused embryos are saved for later use. These are frozen and will require to be thawed before deposition in the womb.
Day three and day five transfers are also known as cleavage and blastocyst transfers. Typically, it is a common practice to wait until the embryo reaches the blastocyst stage on day 5 to complete the transfer. This provides for a much higher rate of success, as opposed to the standard day 3 transfer. However, there are risks associated with day 5 transfers, and is not recommended in all cases.
A single-embryo transfer is a procedure in which one embryo, selected from a larger number of available embryos, is placed in the uterus. The selected embryo is either from a previous IVF cycle (frozen) or a fresh embryo. To mitigate the risk of failure, multiple embryos are often transferred. However, transferring more than one embryo doesn’t increase the chance of getting pregnant, but it does increase the risk of multiple pregnancies.
Key Decisions Regarding Embryo Transfers that will help you
Picking the right embryo and the type of transfer to be made are two of the most important decisions one must make for the success of the IVF treatment. Each embryo is graded based on its appearance and This assessment includes looking at the number and size of the cells, the rate of development, and other factors. This helps ascertain and arrive at the decision of picking the right embryo for the transfer.
The second important factor to be weight in is the type of embryo transfer. Fresh transfers can take much less time compared to frozen ones, and with the advancements in fertility treatments one embryo transfer is ideal. Multiple embryo transfers do not hurt but could potentially lead to multiple pregnancies.
Finally, an additional component is increasingly coming into the picture – genetic testing prior to the transfer. While the advantages include mitigation of risks such as miscarriage, genetic disorders, and others. There are ethical and considerations of costs to be ascertained before going ahead with the same.