Freezing My Blastocyst


Patient asks: "Unfortunately, my endometrium wasn't ready when the transfer was programmed and I had to freeze my blastocyst. What are my realistic possibilities?"


When an egg is fertilized by a sperm cell, it becomes an embryo. As the embryo begins to divide and multiply its cells, it reaches the blastocyst stage by day 5. An embryo that survives for five days is more viable for implantation.

At this point, endometrial receptivity is crucial. This can be assessed via ultrasound, hysteroscopy, and hormonal receptor analysis. If conditions are not optimal, there is an option to freeze the blastocyst.

Head Physician of UNICA Brno, Dr. Frgala explains further: "The endometrium might not always react to the dose of estrogen hormones as we wish. Freezing the embryos is not a tragedy these days because the cryopreservation procedures are very gentle. Technology has advanced so far, even in the last few years, that the success rates using preserved embryos are almost the same as a fresh cycle. There are also alternative ways to prepare the endometrium which might not be available for the first transfer."

Check out other patient inquiries from our Question and Answer Session with Dr. Frgala, by viewing the full video here:


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