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Transferring frozen embryos allows us to maximize the chances of IVF success. Conventionally, we transfer fresh embryos in an IVF cycle. Typically, we select the best quality embryo/s and then transfer it; the only thing we could do at this stage was to hope they would implant. In case there were any supernannuary embryos of good quality left over, we would then freeze these. In the event that the fresh cycle failed, these frozen embryos would then be used for transfer in a subsequent cycle.
Fresh Vs Frozen Embryos
There was a time, not many years ago when frozen embryos wouldn’t even be considered for use, if it was possible to get fresh ones. The understanding was that the former weren’t as good as the latter. Today, there is complete change in this trend and many clinics are now observing that when they use frozen embryos, the pregnancy is much better, compared to fresh cycles. Though this may seem a little improbable if you use only logic to understand this, there are a number of reasons why this is the case:
The Focus Point
When we do a fresh cycle, the priority is to grow as many eggs as possible. We use hormones for superovulation; these end up distorting the receptivity of the endometrium. And so, on an ultrasound, even if it seems like the endometrium is perfect, it may not really be optimally receptive to accept the embryo that has been transferred.
In comparison, when frozen embryos are being transferred, we are able to use the natural cycle. This means we are able to focus only on preparing the endometrium with hormones to ensure that it’s optimally receptive. And so , when we transfer good quality frozen embryos, we then have much better success rates.
Though there are distinct advantages to using frozen embryos, there are some disadvantages that can’t go without a mention either.
Read more- Embryo Freezing : Embryo Cryopreservation
There has been a significant advancement in embryo freezing technology. When frozen embryos are being transferred, we are able to use the natural cycle. This means we are able to focus only on preparing the endometrium with hormones to ensure that it’s optimally receptive. Transferring frozen embryos gives allows us to maximize the chances of IVF success.
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