IVF Frozen Embryo Transfers Are Increasingly Successful
In-vitro fertilisation (IVF) has become a cornerstone of fertility treatment across the world, and a growing number of success stories now owe their beginnings to a specialised technique called Frozen Embryo Transfer (FET). While IVF itself has helped millions conceive, the FET process has emerged as a game-changing advancement, offering higher success rates, reduced risks, and increased flexibility.
But what makes frozen embryo transfers so promising? Why are more clinics recommending them as a first-line strategy? This article explores the growing trend of FETs in IVF, the science behind the success, and what aspiring parents should know before embarking on the journey.
What is a Frozen Embryo Transfer (FET)?
A Frozen Embryo Transfer refers to the process where embryos, previously created through IVF and cryopreserved, are thawed and then transferred into a woman’s uterus. This differs from a fresh embryo transfer, which involves transferring the embryo shortly after fertilisation.
The freezing process, known as vitrification, allows embryos to be stored at sub-zero temperatures without damage. These embryos can then be used in future IVF cycles, often resulting in equally — or even more — successful outcomes.
How Does FET Differ from Fresh Embryo Transfer?
While fresh embryo transfer occurs within a few days of egg retrieval and fertilisation, FET gives the body more time to recover. Here's a quick comparison:
| Feature | Fresh Transfer | Frozen Transfer |
|---|---|---|
| Timing | Few days after fertilisation | Can be weeks or months later |
| Hormonal Environment | Post-stimulation (potentially unstable) | Optimised natural or medicated cycle |
| Success Rates | Variable, depending on individual health | Often higher due to improved uterine readiness |
| Flexibility | Limited | High — allows scheduling convenience |
Why Are Frozen Embryo Transfers Becoming More Successful?
There are several factors contributing to the rising success of frozen embryo transfers: