How successful is egg freezing technology?
According to infertility therapist Dr Lord Winston, the birth rate after using frozen seeds is only one percent, while others report higher rates.
Lord Robert Winston mentioned on the BBC Radio 4 program that the ovaries were frozen for 10 years.
Lord Winston, a professor at Imperial College London, warned that “this is a failed technique” and that these ovarian changes after freezing had only a one-percent effect.
However, they gave the percentage of childbirth.
The Human Fertilization and Embryology Authority (HFEA), which regulates infertility treatment in the UK, reports that in this regard, one in five case reports is far better than Lord Sandston’s one percent. Yes.
Why are these numbers different?
This is because both are measuring success at various stages of infertility treatment.
The process of IVF goes beyond the scope of frozen ovaries as follows:
Frozen eggs are not frozen.
Those who survive this freezing process are fertilized.
Successfully fertilized seeds become embryos
One or two embryos that survived (up to three for women over 40 years old) were then transferred to the womb.
One percent of Lord Winston’s data relates to ovaries that survived the freezing phase, which later led to pregnancy and the birth of babies. However, when he described the pregnancy rate in the House of Lords as 1.8%, he obtained 2016 data from the HFEA.
When Lord Winston asked this question, no statistics were available in 2016, but when reviewing the 2015 data, as many as 2% of non-frozen ovaries converted to pregnancy. 0.7% were born.
The NHFEA’s conclusion is based on how many embryos have reached birth. Under the same method of measuring success rate, in 2017, 19% of patients received IVF treatment of their own disease.
Both ways left some information
If you want to freeze your ovaries, you may want to know the possibility of IVF pregnancy. But considering the success rate of each ovary (rarely), people forgot to use multiple seeds in the IVF round.
NHS gynecologist Dr Sarah Martins da Silva explained, “This way, people will be frustrated during treatment.”
“Not every ovary becomes an embryo, not every embryo is infected with a pregnancy, and not every pregnancy is infected.”
Seeds are wasted at every step from non-frozen to fertile, to embryos, to the uterus, and not all seeds involved in this process are intended to be used.
However, the HFEA data relate only to birth rates in cases where embryos are transferred to the uterus, but not every treatment is attributed to embryos. This means that if the stage before embryo transfer is included, the success rate of HFEA will be reduced.
When Lord Winston requested data in 2016:
1204 seeds were not frozen, but it is unknown how many IVF rounds were performed for them.
Of these, 590 (49%) seeds were fertilized.
Of these 590 patients, 179 (30%) were transferred.
Of the transferred embryos, 22 changed during pregnancy, accounting for 13%.
This year, 6,199 seeds have been frozen, perhaps not yet.
Since the HFEA does not release statistical information on a regular basis, there is no latest statistical information in this regard.
This does not even indicate the success rate of women in personal affairs. This is an average figure, but some women’s seeds are frozen, while others do not.
The chance of getting pregnant depends on the woman’s age and her general health when the disease was frozen.
According to HFEA data, the birth rate of each method is higher than that of women who were younger than 35 years of age at the time of the disease’s freeze, and that rate decreases with age. That is, in a young healthy woman, the odds are higher than 19%.
Dr Jara Benagi works at the Reproductive Health Center, and her private clinic freezes women who do so for “social” rather than medical reasons. The birth rate in their clinics throughout the treatment period was 27%.
The HFEA also noted that few women in the UK use frozen seeds, so it is difficult to get such difficult results with such a small sample