Who can benefit Blastocyst transfer?
Blastocyst transfer is recommended if you have produced good grade embryos in a previous IVF/ICSI cycle but no implantation occurred. The embryology team will discuss this option with you once your day 3 embryos have been reviewed.
Are there risks associated with Blastocyst transfer?
Data is rapidly gathering on outcomes of blastocyst transfer pregnancies. However, at this moment in time, the numbers of blastocyst transfers are still relatively small compared to the traditional two to three day transfers. There appears to be an increase in the incidence of identical twins with blastocyst transfer, but there has not been any obvious rise in any other risks associated with blastocyst transfer. Not all embryos will develop to produce blastocysts in the laboratory. Embryos can stop developing at the four-cell stage (day two) and progress no further. If your embryos stop developing or do not reach the blastocyst stage we may advise cancelling your ET. This is a difficult experience to go through, but does avoid you continuing to take medication for 2 weeks and the anxiety of waiting to perform a pregnancy test when there is very little chance of a positive result.
The embryologist may advise your consultant that in your case it is safer to consider a day 2-3 embryo transfer than risk having no blastocyst to transfer on day 5 or 6.
As with normal embryo transfer, due to the risks of multiple birth should more than one blastocyst is transferred, you may want to consider a single blastocyst transfer.