Pregnancy Rates in Frozen Embryos and Fresh Ones in IVF is The Same!
New research revealed that frozen embryos are as good as fresh ones for in vitro fertilization (IV.F). This means the success of pregnancy rates and live births were equivalent in a group of IVF women implanted with frozen embryos compared with fresh embryos.
This new discovery was confirmed by lead author Dr Lan N. Vuong from the Department of Obstetrics & Gynecology, University of Medicine and Pharmacy at Ho Chi Minh City, and My Duc Hospital, Ho Chi Minh City. Along with this good news for infertile couple, the study also highlighted the benefit of freezing and subsequent transfer of embryos.
Vuong said, “Our key finding is that freezing embryos for IVF is not harming a couple’s chances of having a baby. After the first fresh embryo transfer, it will be possible to freeze the remaining embryos and transfer them one by one, which is safe and effective.”
The study was launched by a group pf international researchers from Vietnam and Adelaide, Australia.
The Study and Interesting Results
The study investigated almost 800 women who had infertility not related to polycystic ovarian syndrome (PCOS). Women were given one cycle of IVF, where either a transfer of fresh embryos occurred, or all embryos were frozen and one cycle of thawed embryos occurred subsequently without the use of IVF drugs.
The researchers used the common freezing method known as Cryotech vitrification.
Here are the interesting results!
The result showed that after the first completed cycle of IVF, the ongoing pregnancy occurred in 36% of women in the frozen embryo group, and in 35% of the fresh embryo group.
In addition, rates of live birth after the first embryo transfer were 34% in the frozen embryo group, and 32% in the fresh embryo group.
Aside from that, the study gave new insights that infertile women not suffering from PCOS have equivalent live IVF birth rates from frozen embryos, which is contrary to previous notions that infertile women with PCOs benefit from significantly higher live birth rates from frozen embryos in IVF procedures.
The Popularity of Frozen Embryo Techniques
Frozen embryo techniques are getting popular in infertility clinics around the globe. The process involves retrieval of eggs eggs for freezing in which a woman undergoes the same hormone-injection process as in-vitro fertilization (see IVF Cycle Details). The only difference is that following egg retrieval, they are frozen for a period of time before they are thawed, fertilized and transferred to the uterus as embryos. Embryos tolerate freezing very well and and it is expected that 90% of embryos to survive the process.