Chemotherapy

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The fertility expert, Lord Robert Winston appeared on the BBC Radio 4 Today to discuss the program.

Lord Winston has warned, professor of fertility studies at Imperial College London, it was "a very unsuccessful technology" and said: "The Number of eggs that actually cause a pregnancy, after freezing about 1%. "He later clarified, he was referring To Live births.

But The Body regulates fertility treatment in the UK, the Human Fertilisation and Embryology Authority (HFEA) - the success rate closer to a Five , a far better chance than The One that fails in a hundred Lord Winston.

So, why the different numbers?

is It because the two measure the success rate, based on the different phases of the fertility treatment.

A cycle of IVF with frozen eggs goes something like this:

Lord Winston, 1% figure referred to the proportion of all frozen eggs for use, thawed, in the treatment of infertility, the pregnancy and subsequent birth. Data from the HFEA from 2016, in response to A Question in The House of Lords,

There are no data on live births are available for 2016, the Time Lord Winston asked the question, but with an eye on 2015 data, 2% of the thawed eggs ended up as pregnancies and 0. 7% of live births.

The HFEA measures success based on how many embryos (developed from cryopreserved oocytes) will result in a live birth. With this measure, 19% of IVF treatments using patients ' own frozen eggs were successful in the year 2017.

Both measures to miss some of the information

If you are thinking of freezing your eggs, you probably want to know how likely you are to get pregnant from one round of IVF. But looking at the success rate for each individual egg (much lower number) ignores the fact that a round of IVF includes several eggs.

And there is an expected "abrasion", this is done through the course of the treatment, explains Dr. Sarah Martins Da Silva, a NHS gynaecologist and lecturer in reproductive medicine at the University of Dundee.

"Not every egg makes an embryo, not every embryo makes a pregnancy and not every pregnancy makes a baby," she says. From thawing to insemination, development of an embryo, the transfer of the embryo into a uterus, the eggs are lost at every stage, and it is never the intention that each egg is used in a treatment cycle.

But the HFEA data sees only the birth-rate once the embryo is transferred - and not every treatment cycle is the result of a embryo. This means that the HFEA the success rate could be lower, if it is women whose IVF cycle fails, even before an embryo is implanted may be

In the year 2016, when Mr. Winston asked for the data:

There is more recent data from the embryo-transfers, but the HFEA does not regularly publish the above data on the thawing and fertilization.

And this still does not tell you about the prospects of success for the individual women. This is an average, but within this group, some women, all the eggs can survive thawed, while others do not have.

your Chance of becoming pregnant will also greatly depend on your age at the time their eggs were frozen, and their General health.

women under 35 at the time, their eggs were frozen, have the highest number of births per cycle of treatment, according to HFEA data, and this rate decreases with age. So, a younger, healthier woman would have a chance of higher than 19%.

The 19% figure, the freezing of oocytes cycles funded by the NHS, for medical reasons (about one-fifth of the total amount). Most of them will be women, to preserve the already sick - often with the opportunity to have children after the fertility-damaging treatments such as Chemotherapy and thus may have a lower chance of pregnancy. freeze,

Jara Ben Nagi is a doctor at the center for Reproductive Health , a private clinic that only deals with healthy women freezing their eggs for social rather than medical reasons. She says her clinic has a birth rate of 27% for a full treatment cycle, which is the same rate that was found in a Spanish study of More Than a thousand healthy women using social egg freezing.

The HFEA also advises that a very small number of women in the UK, go freeze your eggs again, you can use, so it is hard to pull is to hard, the conclusion to be drawn from such a small sample.

reality check, ivf

Source of news: bbc.com