Frozen Embryo Transfer


A new alternative to the traditional “slow freezing” method for embryos has been prevalent since the 1980’s. The new vitrification method for freezingIVF extracted embryosis now more popular and safer since it has a much higher ‘post-thaw survival’ and success rate as compared to older methods of cryopreservation.

Not only this, the pregnancy success rates are also more favourable in this method.


What Is The Normal Process Of Fertilization During A FET- IVF Cycle?


In this process, excess healthy embryos from your current IVF cycle will be frozen. Its major advantage is that in the unfortunate event of an unsuccessful IVF cycle, you do not have to undergo all the hormonal injection stimulation again and only medicines are given to prepare the womb’s lining and embryo transfer is done. If you conceive in the current cycle, these embryos can be kept frozen for you for a long time and can be used by you to have a second pregnancy.

Also, this method of cryopreservation also works best for older couples since it gives you more opportunities for a successful pregnancy even during the latter years of your life.


Normally, at least 60% of all patients undergoing IVF treatment opt for FET to ensure that they have multiple chances of a successful pregnancy.

Good-quality embryos can be frozen from Day 2 (the four cell stage) to Day 5 (the Blastocyst stage). For freezing, they are placed inside thin plastic straws that are sealed at both ends and labelled with your name and IVF identification number. They are frozen at 150° Celsius inside a freezing machine that are much faster at freezing in comparison to the older methods of cryopreservation.

The straws are finally placed inside insulated goblets and put inside the large tanks filled with liquid nitrogen kept at -196° Celsius to ensure that your embryos stay safe for a really long time.

How Does The FET Procedure Work?


A patient’s records reviewed before she begins a frozen cycle in which her pre-screening is scrutinized to check whether it is up-to-date or not.

Some blood tests, updated mock ET, injection review and Pap Smears to ensure that they are ready for generating healthy embryos.

During her cycle baseline, the patient will be administered sequential injections of estrogen or oral medicines to help build her uterine lining called the endometrium. A thicker endometrium ensures better embryos. Once the embryos are obtained, they are transferred into the cryogenics department for safekeeping.

Estrogen and progesterone will continue during the frozen transfer to ensure that good-quality embryos are produced.

Is FET A Safe Procedure For Her?

This procedure is totally safe since FET ensures that you won’t have to go through another cycle of hormone stimulation and egg collection over and over again each time you wish to get pregnant or try another IVF cycle.

You can always choose to donate or discard your embryos in case you have achieved successful pregnancy and do not wish to get pregnant anymore.

Risk Factors

Supplemental administration of oestrogen and progesterone medications can sometimes cause menstrual cramps.

A sonogram check can ensure that they can be stopped if the mid-lining has been achieved.

Who Can I Talk To If I Have Further Questions?

  • When you opt for a FET procedure cycle, your Physician will explain to you all the details about the procedure and the possible risks involved with it.
  • The medical staff at our IVF centre is highly familiar with the procedure and can give you all the latest information regarding it.
  • We encourage you to ask as many questions as you can to be assured that all your queries have been answered.