Chromosomal Testing Could Increase IVF Success Rate

When they are not able to conceive naturally, many couples turn to in-vitro fertilization to become pregnant. Unfortunately the cycle may not be successful causing many to undergo several rounds of IVF before a viable pregnancy is achieved. Some never receive the pregnancy they had hoped for. A new type of IVF testing, however, hopes to change all of that.


According to current statistics, the success rate worldwide for IVF is about 30%. Many fail due to chromosomal abnormalities. These abnormalities are the focus of the new form of testing.

Dr. Dagan Wells and his team at Oxford University have been working on a testing procedure that would test all embryos for chromosomal abnormalities as well as two new markers that could cause pregnancy failure. With this new line of testing, the success rate of IVF could increase to about 70% in the very first cycle.

Before being transplanted into the mother, the embryos are grown for five days in a laboratory setting. They are then tested and analyzed to determine the chromosome number. Embryos that are healthy are transferred to the mother. Those that are not healthy are not transplanted.

“The vast majority of embryos transferred worldwide have no genetic screening and 85% of these fail to establish a pregnancy,” said Dr. Wells. “If you transfer to the uterus embryos that are confirmed to be chromosomally normal and develop well, reaching the blastocyst stage, the chance of producing a child is very high, about 70%.”

Looking at the current success rates, 70% seems like a massive achievement, but the study authors say it’s not enough. Their goal is to push the success rate of the first IVF cycle as close to 100% as they possibly can.

“That still leaves 30% that don’t make it. Why? We need a better understanding of the biology, allowing us to bridge that gap and approach 100% success,” said Dr. Wells. “Chromosomes are a big part of the story but they are not the be all and end all. There are many aspects that make up a viable pregnancy.”

The testing method has already received a great deal of attention. In fact, the scientific community is so excited about the potential of the testing method that the U.S. Society of Assisted Reproductive Technologies has already presented an award to the study authors.

Supporters, like Tony Rutherford, the chairman of the British Fertility Society feel that the success of this study is not only beneficial for the parents, but for the scientific community and health care field overall. According to Rutherford,

“This exciting novel technique is taking the molecular assessment of the embryo to a new level, and clearly is an important tool for research into embryo health. Selecting the right embryo for replacement in a cost-effective, reproducible manner potentially has enormous benefits for patients, clinics and the health service overall.”

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About the author


Kate Givans is a wife and a mother of five—four sons (one with autism) and a daughter. She’s an advocate for breastfeeding, women’s rights, against domestic violence, and equality for all. When not writing—be it creating her next romance novel or here on Growing Your Baby—Kate can be found discussing humanitarian issues, animal rights, eco-awareness, food, parenting, and her favorite books and shows on Twitter or Facebook. Laundry is the bane of her existence, but armed with a cup of coffee, she sometimes she gets it done.

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