Blastocyst Transfer

In the journey of IVF, a blastocyst is a day 5 or day 6 embryo formed after fertilization. It is the final stage of embryo development in the lab; beyond this we cannot culture in the lab. Unlike earlier stage embryos (Day 2 or Day 3), a blastocyst has more cells and a fluid filled cavity, making it more likely to implant successfully in the uterus.

THINK OF IT AS AN EMBRYO THAT HAS “GRADUATED” TO A MORE ADVANCED STAGE, READY FOR NEXT STEP – “IMPLANTATION”.

WHY IS BLASTOCYST PREFERRED ?

1. Higher Implantation Rates : Embryos that survive to Day 5 are generally more stronger and more viable. Formation of Blastocyst depends on both egg and sperm quality; hence like a process of natural selection they increase the pregnancy potential by 10-15%.
2. Better Embryo selection : Culturing embryos longer helps embryologists identify the best ones.
3. Natural Uterine Synchrony : The uterus is often more receptive to implantation at this time. In natural conception also, implantation occurs at blastocyst stage and hence simulates a natural conception.
4. Embryos available for genetic testing : Preimplantation genetic testing is carried out at blastocyst stage; so culturing to blastocyst stage gives an opportunity to carry out preimplantation genetic testing.
5. Fewer Embryos, better results : As the science is advancing, we are progressing towards elective single embryo transfer. Single blastocyst transfer helps to achieve a safe pregnancy.

WHO CAN BENEFIT FROM BLASTOCYST TRANSFER ?

Blastocyst transfer is ideal for :

1. Women with multiple high quality embryos
2. Couples with previous failed IVF attempts
3. Patients opting for elective single embryo transfer (eSET)
4. Patients planned for preimplantation genetic testing
5. Young women or those using donor eggs.

Personalized care is essential before planning any treatment. One Shoe doesn’t fit all.

STEP BY STEP : THE BLASTOCYST TRANSFER PROCESS :

1. Ovarian Stimulation : Hormonal injections to stimulate the ovaries to produce eggs.
2. Egg Retrieval : Short day care procedure carried out under anaesthesia transvaginally.

• Fertilization : Eggs and sperms are combined in the lab either through the process of IVF or ICSI.

6. Embryo Culture : Embryos are cultured till day 5 or day 6.
7. Embryo Transfer : It can be fresh or frozen embryo transfer; and a good quality blastocyst is gently placed into the uterus using a thin catheter.

The procedure is painless, takes just a few minutes and doesn’t require anaesthesia.

SUCCESS RATES WITH BLASTOCYST TRANSFER :

Studies show that blastocyst transfers have higher success rates than day 3 transfers, especially in younger women and in cases where good quality embryos are available.

Factors influencing success are :

1. Female age
2. Embryo quality
3. Uterine receptivity
4. Immunological factors
5. Any associated medical conditions

PROS AND CONS OF BLASTOCYST TRANSFER

CONCLUSION :

Blastocyst transfer offers a more precise, effective and patient friendly approach to IVF. Personalized IVF matters. At our clinic, we carefully evaluate your case to recommend the most suitable strategy- be it Day 3 or Day 5 transfer.