How Does Frozen Embryo Transfer (FET) Increase Your Chances of Pregnancy

How Does Frozen Embryo Transfer (FET) Increase Your Chances of Pregnancy

IVF is a popular fertility procedure that most women opt to get pregnant. No doubt, IVF is a trusted means to fulfil your dreams of pregnancy and motherhood. But there are other options as well that help a woman get pregnant. Frozen embryo transfer implantation is one of them. It a natural successor to any IVF process and its benefits will help you make better financial decisions as well as invest in family planning the right way.



What Is a Frozen Embryo Transfer?

When an embryo created during an IVF cycle and frozen for storage is retrieved and utilized for a pregnancy cycle, it is termed as a FET or a frozen embryo transfer. This saves on undergoing a repeat IVF cycle altogether.





Why Would You Freeze an Embryo?

During the process of IVF, there is a possibility of creating multiple healthy embryos. These can be stored for later cycles, should the current one fail, or if you choose to get pregnant again at a later stage in life.

When Can You Have Frozen Embryo Procedure

There is no rush for using frozen embryos since they can retain their potential to no end. A FET can be conducted after an IVF procedure has failed to bear fruit, or even later in life when an IVF cycle does not help obtain healthy eggs.




An embryologist doing his job

Benefits of Frozen Embryo Transfer

Although frozen embryo transfer may not seem like the most natural way of giving birth, there are a bunch of benefits which may convince you to go for this procedure. It is not only good for the mother’s well-being but also helps in making smart decisions when it comes to the future of the child and the family together. Let’s find out what are the benefits of frozen embryo transfer.

1. Ability to Plan a Family at a Later Stage

These days couples generally focus on their career and want to achieve success in life and then start with family planning. But as a woman’s biological clock keeps ticking, it may be a tussle for her to establish a balance between her personal goals and the chance to start a family. Making use of frozen embryos can help a woman undergo the procedure and have a child even until she is nearly 50 years old.





2. Genetic Issues Are Detected

The news of pregnancy is wonderful. But if your baby is diagnosed with certain problems and your doctor suggests that you do an abortion, it is extremely disheartening. But with the option of external embryo creations, their genetic makeup can be examined. Also, any genetic defects can be determined beforehand. Based on the results, you can opt for the embryo that has the best chances of growing into a healthy child.

3. The Risk of Ovarian Hyperstimulation Syndrome is Reduced

Ovarian hyperstimulation syndrome (OHSS) is usually observed in women who tend to have oestrogen levels way above the safe mark; women who are susceptible to an increased number of follicles; women who gain weight rapidly during pregnancy, and so on. If a woman with such signs gets pregnant, the embryos can be opted for frozen storage to avoid any risks. Pregnancy can be executed later on when the conditions are suitable for it.




4. The Risks in Pregnancy when Progesterone Levels are High are Avoided

Medical sciences and research have made observations that have established a link between high progesterone levels and embryo implantation. The lining of the uterus, termed as the endometrium, does not portray a favourable response to the embryo for implantation when the progesterone levels in a woman are high. In such a case, opting for freezing the embryos can help you avoid a loss of pregnancy later on.

5. The Ease with Which a Cycle of Frozen Embryo Transfer Can Be Conducted

Compared to many other procedures, many women tend to favour and opt for a frozen embryo transfer, or FET, once they know the details. Primarily, the entire procedure is surgery-free, including the obtaining of the eggs. No anaesthesia needs to be administered and it is painless. Hence, it a convenient and painless option for pregnancy.





6. The Cost of Undergoing a Frozen Embryo Transfer is Less Than Creating Fresh Embryos

The cost of fertility treatments, particularly in-vitro fertilization, are usually high. Compared to those, opting for a frozen embryo transfer to continue a pregnancy is much cheaper than generating embryos all over again.

7. The Existence of an Opportunity to Have Additional Cycles Without Going from Scratch

Once you undergo the stimulation from the medicines and other procedures of the in-vitro fertilization, the embryos that are created from the eggs obtained in that cycle can be frozen and stored for later use as well. This allows you to have a repeat pregnancy later in life, or even resume an interrupted one.




How and Where Are Embryos Frozen?

Embryos are frozen using a technique called as vitrification. They are stored within plastic trays placed within glass goblets. Once frozen, these are stored in cryopreservation chambers that make use of liquid nitrogen to keep the embryos safe.

Vitrification process

Frozen Embryo Transfer Procedure

To begin a frozen embryo transfer cycle, the embryos are thawed and prepared for implantation. Based on the stimulation medicines and the woman’s optimal date, the embryos are transferred via the vagina and allowed to implant within the uterus.





What Is the Success Rate of Frozen Embryo Transfer Procedure?

The success rates of pregnancy with a FET are the same as that of a fresh cycle via IVF. Women who are 35 years old or less can expect a 60% success rate. However, it plummets as a woman’s age increases.

Factors That Affect the Success Rate of Frozen Embryo Transfer

For many years, the success rates associated with a frozen embryo transfer were quite erratic. But in recent years the factors that govern the success of the FET procedure were determined. There are two major ones that play a vital role in that regard.




1. The Technique Used to Freeze the Eggs

In recent years, the cryopreservation process has been replaced with a smarter, modern one. This is called as vitrification. Quite contrary to cryopreservation, vitrification makes use of freezing in a flash, by suddenly cooling down the embryos to a freezing point within a matter of seconds. It also makes use of certain substances that protect the embryos, avoiding the formation of ice crystals. This has ramped up the survival rate of the embryos to nearly 95%.

2. The Quality of the Embryos Procured

Embryos were being created in labs for many years, but their chances of surviving in those conditions were extremely low. Even if they were transferred successfully, the implantation within the uterus would fail. In recent years, the techniques and equipment have improved considerably. Now, embryos are known to survive for nearly a week at the blastocyst stage, the point where an embryo transfer has the highest chance of success in matters of implantation and continued pregnancy.





How Soon After a Frozen Embryo Transfer Can You Take Pregnancy Test?

Similar to an IVF cycle, it is recommended to wait for at least a couple of weeks before undertaking a pregnancy test. Any earlier than that could result in a false positive. The tests should be repeated again after a few days for a confirmation.

Can Anything Go Wrong with a Frozen Embryo Transfer?

As advanced as frozen embryo transfer might be, there are a few possibilities that can make a transfer go wrong.




1. Presence of Fluid in the Uterine Cavity

While the uterus is constantly producing and leaking fluid, some of it might be stored in the cavity, reducing the chances of embryo implantation. It could also indicate a presence of blocked fallopian tubes, which can be corrected with a surgery. But if that isn’t the case, draining the cavity is a challenge and might require cancelling the FET altogether.

2. Wrong Time to Carry out the Transfer

Some women ovulate earlier than expected, shifting the implantation window to a different zone. Medical testing can help determine the right timing of the window and adjust the transfer accordingly.


3. Ovulation at an Unexpected Time

Progesterone supplements that are taken to prepare the endometrium for implantation are used as a marker to determine the right timing for transfer. A shifted ovulation can cause progesterone levels to rise early on and make it difficult to transfer correctly. Certain medications can also be administered to prevent ovulation from taking place.

4. Presence of a Thin Endometrial Lining

Even after medications and treatments, the endometrium may not be as thick as needed for a successful implantation. This can substantially reduce the success rate of a FET. Doctors usually strengthen the medication to counter this issue and carry out the FET anyway or cancel the procedure completely.

5. FET Problems Due to Undetermined Factors

The entire process of implantation depends on numerous factors that are beyond hormones levels and endometrial strength. While research is being conducted to determine more dependencies that are present, a FET may continue to fail even when the conditions seem to be optimal.

What are the Risks of Frozen Embryo Transfer?

A frozen embryo transfer surely has many benefits but it has its risks too. The benefits are absolutely feasible but so is the possibility of things not going ahead as expected. Know what are the risks of frozen embryo transfer:


1. Multifetal Pregnancy

There are multiple embryos that are transferred during FET to help with implantation. At times, many embryos among those could be implanted successfully causing you to be pregnant with triplets or even more babies. This might require you to undergo fetal reduction to ensure a better chance of completing the pregnancy successfully.

2. Failure of Medical Equipment

All medical equipment used in fertility clinics and for the FET procedure is kept to a high standard of functioning. Despite that, there are chances of malfunction that could lead to a total loss of obtained eggs and frozen embryos. This may call for undergoing an IVF procedure again.

3. Ectopic Pregnancy

When FET is being conducted, some embryos may not be ready for implantation and may continue to stay outside the uterus. At times, these could float towards the fallopian tubes and enter them, causing them to be implanted inside those. Such an ectopic pregnancy can be harmful to the mother and needs to be terminated immediately.

How Long Can Embryos Be Frozen and Still Be Viable?

The frozen embryos can retain their potential for nearly an infinite time. They can be utilized at any point in your life whenever you want to get pregnant.


What to Do with Leftover Embryos?

The leftover embryos could either be allowed to thaw and terminate naturally. Alternatively, you could donate them to other people or allow them to be used for scientific research.

What Is the Storage Cost of Frozen Embryo?

The cost of storing a frozen embryo depends from clinic to clinic. However, it starts from one lacs at the very least.

What Is the Cost of Frozen Embryo Transfer?

Embryo transfers can be covered by certain medical insurance policies. If not, the entire process can cost in the range of 3-4 lacs, excluding any medication that might be required.

Knowing the correct frozen embryo transfer implantation timeline is key to achieving a successful pregnancy from the procedure. Understanding the long-term benefits of FET can help you plan your family in the manner of your choosing.


Also Read: Implantation Cramping – What Is It