(Frozen Embryo Transfer)

The eggs you have had frozen in connection with an IVF treatment can be used for egg implantation (transfer). You can do it in your natural or in a stimulated cycle.

Contact us

FET – Frozen Embryo Transfer

If, after the fertilization process in the laboratory and a possibly “fresh” trasnfer, there are “surplus” embryos of high quality, they can be frozen and stored in liquid nitrogen. The embryos can later be hatched and transferred.
This is possible both in a stimulated and in a natural cycle.

We only freeze embryos that have developed to the blastocyst stage.

Development of embryos

You can put the egg back in the embryo stage (day 2-3) or the blastocyst stage (day 5) – in other words, these are fertilized eggs in different developmental processes (cell division). As mentioned, only eggs in the blastocyst stage can be frozen.

Approximately 25% of the fertilized eggs develop into blastocysts. Whether the eggs can be cultured right up to day 5 depends on your age and the number of fertilized eggs.

For women who have only a few eggs of inferior quality, depositing the fertilized eggs on the second or third day may be preferable, as the eggs enter the natural uterine environment more quickly, where they can best survive. The excess eggs that develop into blastocysts can of course be frozen for up to 5 years or until the woman turns 46.

There is a small risk that a blastocyst will not survive thawing, but the vast majority make it through the process.

With us, this success rate is over 95%.

One or two eggs

With an egg transfer, you make a decision in consultation with the doctor about whether one or two eggs should be transferred.

The criteria for that are your age, weight, your fertility history and any illness or other condition that means a twin pregnancy could be dangerous for your health.

Young patients who are younger than 37 years are generally recommended only one egg in the first two attempts.

When the transfer takes place in a freeze cycle, we ask you to sign a written consent confirming that you allow us to thaw.

This consent must be in our hands at the latest early in the morning on the day the transfer takes place.

The egg transfer itself is a small procedure that only takes a few minutes and is usually not painful. The egg is placed in the uterine lining with the help of a small, thin catheter. You then continue to use vaginal Progesterone and take the pregnancy test approximately 12-14 days after transfer.

There is no need to take a break between frozen embryo transfers.

Why choose Sellmer Clinic for your treatment?