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King's College London - Health: More than a medical matter

First study of chromosome test suggests increase in IVF success

08 May 2012

By Ana Pallesen

Appeared in BioNews 655

An IVF test which checks whether embryos carry the correct number of chromosomes could improve the chances of a successful pregnancy, a clinical trial suggests.

The test – developed by the biotech company Blue Gnome – is used five days after an egg has been fertilised and helps doctors select which embryo should be implanted during fertility treatment.

In a clinical trial published in the Journal of Molecular Cytogenetics, using the test resulted in a 65 percent increase in pregnancy at 20 weeks compared to the control group. In total 103 IVF cycles were included in the trial and all the women were under 35.

Dr Simon Fishel, managing director of CARE Fertility, who has helped develop several IVF screening techniques during his career, said the paper represented 'a breakthrough clinical study, showing for the first time how this technology, which CARE helped pioneer, can greatly improve IVF success rates for younger patients'.

Evidence suggests that abnormal chromosome number, called aneuploidy, in embryos significantly reduces the chances of IVF success. Aneuploidy is relatively common and in most cases means the embryo will not develop.

In the new test, called 24sure, cells are extracted from five-day-old embryos. The DNA from these cells is analysed; according to a promotional website, 'over 3000 measurements are made, covering all available chromosomes'. The results are available in 12 hours which means that embryos do not have to be cryopreserved while the test is running.

Currently, for women under 35 only around a third of IVF cycles lead to a live birth, with that figure decreasing as women age. Any technique that would increase pregnancy rates is therefore highly sought after. Such a development would also reduce the drive to implant more than one embryo during IVF, which can result in risky multiple pregnancies.

Although this is the first clinical trial of 24sure, the test is already used in fertility clinics. Blue Gnome's website says that the technique is 'widely available in the UK through a number of private IVF centres'.

Blue Gnome CEO, Nick Haan, says that while further studies are still needed, his company's product has the 'potential to become the default standard of care for all IVF cycles worldwide'.

Professor Dagan Wells, from the Nuffield Department of Obstetrics and Gynaecology at the University of Oxford, told the BBC that 'more research is needed to nail down who will benefit, but my gut feeling is that it is valuable'.



20 May 2013 - by Emma Stoye 
A new technique for monitoring embryo health could increase the chance of IVF couples having a healthy baby, according to researchers at a private fertility clinic... [Read More]
29 October 2012 - by Lucy Harris 
Using a new IVF technique could considerably increase older women's chances of pregnancy, a small clinical trial presented at a fertility conference suggests... [Read More]

30 April 2012 - by Greg Ball 
A fertility clinic helped to conceive the first baby born in the UK following the use of a device which allows doctors to record images of a developing embryo in the days following fertilisation, prior to implantation... [Read More]
10 October 2011 - by Dr Lux Fatimathas 
US researchers have developed a way to analyse the viability of human eggs at a genetic level without causing them harm. This technology will help improve the chances of successful IVF for couples with fertility problems... [Read More]
01 November 2010 - by MacKenna Roberts 
The European Society of Human Reproduction and Embryology (ESHRE) has published an updated set of best practice guidelines for fertility clinics on the use of preimplantation genetic diagnosis (PGD) and preimplantation genetic screening (PGS) techniques... [Read More]
19 October 2009 - by Antony Blackburn-Starza 
A new pre-implantation genetic screening technique may improve the chances of conception for patients undergoing IVF, a recent study reveals. At present IVF success rates are at around 30 per cent but by screening embryos prior to implantation this can be improved by avoiding common problems which can result in miscarriage or the embryo failing to implant.... [Read More]
07 September 2009 - by Sarah Guy 
A new egg screening technique has been used to help a 41-year old woman give birth to a baby boy after 13 failed IVF attempts and three miscarriages... [Read More]

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