Embryo transfer is introduction of an embryo into the uterus. We introduce only embryos of the best quality and in such developmental stage in which they would get into the uterus under natural conditions.
The procedure itself is very simple, quick, and painless, like a normal gynaecological examination. The doctor uses a special catheter, and together with ultrasound observation inserts the embryo into the uterus. After the transfer the patients keep resting for about 15 minutes, and afterwards they can leave home.
Why we always introduce only one embryo
Thanks to our long-term statistics we have found out, that the number of embryos introduced at once does not increase the overal success. But the total number of transfers does. It depends on the quality of the embryo and of the endometrium. But whether one or two embryos are used at once, has no significant effect on the final result. The chances of pregnancy increase with more transfers of one embryo of good quality per cycle.
How embryos mutually interact
There is a myth that if there are more embryos transferred at once, they have some kind of positive effect on each other. But it is exactly the opposite. Lower-quality, fragmenting embryos may harm other, healthy embryos. In previous years, we noticed increased percentage of abortions, when we transferred more embryos at once.
Risk of multiple pregnancies
With transfers of more than one embryo the probability of multiple pregnancies is really high. Such pregnancies are often risky and endanger both the mother and her future children. Naturally multiple pregnancies occur in 1.2 % of the Czech population. Theoretically it is possible that a patient after the transfer of two embryos could expect even quadruplets.
There is about 50% chance for each embryo at the blastocyst stage to develop into a pregnancy. If such embryo is screened using PGT techniques and not found to be genetically defective, the chances grow by about another 20 %. Introducing more embryos at once does not increase the chances of getting pregnant, it increases only the risk of multiple pregnancy.
On average we gain 3 quality embryos per an IVF cycle. After 3 transfers of three quality embryos in 3 cycles, the (cumulative) success rates are nearly 100 %.
There is no logical argument supporting introduction of more embryos at once
Our goal is to have pregnant and satisfied patients, who will not undergo unnecessary treatments and the associated stress and enormous emotional strain. We do not want you to undergo IVF cycles, which you do not need and we want to spare you from further unnecessary disappointment and money losses.
Would you like to learn more? Make an appointment for a consultation with our fertility experts.