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Question

When does embryo transfer happen?


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Solution

Embryo transfer:

  1. Embryo transfer refers to the step of the assisted reproductive process in which an embryo is placed in a woman's uterus to produce a pregnancy.
  2. This technique (IVF) can be used in humans or animals, but the goals in these situations may differ.
  3. These are known as intrauterine transfers (IUT).

Embryo transfer occurs:

  1. This procedure is typically performed on days 2, 3, or 5 of embryonic development, but may also be performed on days 4 or 6, depending on specific cycle requirements.
  2. For example, fresh embryo transfers can be performed on day 6 for women undergoing preimplantation genetic testing for aneuploidy or disorders of individual genes, although some units currently freeze all embryos and replace them in future cycles.
  3. There is an important difference between transferring embryos at the mitotic stage (days 2-3) or becoming blastocysts at days 5 and 6.
  4. Choosing to transfer on the second or third day increases the chances of actually transferring.
  5. The reason for this phenomenon is that not all embryos reach their fifth day and become blastocysts. In some cases, the transplant may be canceled.
  6. On the other hand, culturing embryos to day 5 is considered a selection method (only the strongest embryos reach the blastocyst stage), so blastocyst transfer results in higher pregnancy rates.


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