Fresh or thawed embryo transfer: which is more effective?
December 29, 2020
In IVF (in vitro fertilization), when the embryos reach a certain degree of development, they are transferred into the uterine cavity of the future mother. Often, a single embryo is selectively transferred without anaesthesia, as the procedure is completely painless in most cases.
The transfer of fresh embryos is carried out at the right moment in the cycle: once all the stages have been completed, namely ovarian stimulation, puncture, fertilization and embryological culture.
The transfer of thawed embryos consists of implanting previously cryopreserved (vitrified) embryos into the uterine cavity of the mother-to-be. Currently, the vitrification technique allows the cryopreservation of embryos without losses. The survival rate of embryos after thawing is 99%. Therefore, the embryos do not lose quality during cryopreservation and subsequent thawing.
Why is thawed embryo transfer the most efficient?
To increase the chances of pregnancy and eliminate any risk of genetic diseases in the unborn child, NSW (Next Generation Sequencing) is often used. This very precise method of diagnosing embryos requires their mandatory cryopreservation since the result is often obtained within 4-6 weeks.
Therefore, the NSW method contributes to the success of IVF. Thanks to this technique, the transfer of thawed embryos becomes more efficient and is highly recommended for patients who have already had failures at the implantation stage.
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