Blastocyst transfer

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Blastocyst transfer what to expect

In IVF and ICSI treatment, embryos may be transferred on day 2-3 after fertilization or, alternatively, at blastocyst stage, after additional cultivation in an embryology laboratory. A blastocyst is a five, six or seven day’s human embryo. The physician can recommend doing a blastocyst stage transfer, if a patient has a large number of embryos and/or the best embryos are not clearly identifiable on day 3. Waiting gives us more information on how well the embryos are developing and may allow us to make a better choice the most good quality embryos for transfer.

Advantages of blastocyst transfer

  • Performing transfer closer to the natural time. An embryo enters the uterus when the uterine lining may provide a better environment for the embryo implantation.
  • The pregnancy rate per blastocyst transfer is higher than on day 2 or 3.
  • Reduction of the possibility of multiple pregnancy with transferring only one embryo (single embryo transfer, known as SET).
  • Possibilities to carry out more accurately PGD.

Disadvantages of blastocyst transfer

  • Not all embryos develop till blastocyst stage in the laboratory.
  • Cryopreserving the remaining embryos.
  • The risk of multiple births (transfer more than one embryo).

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IVF with fresh donor oocytes

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