New IVF Research

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LONE TREE,Colo. — New research by the Colorado Center for Reproductive Medicine shows that In Vitro Fertilization produces more boys than girls.

In a study of more than 500 patients, the percentage of male and female embryos transferred was about the same, but researchers found a higher live birth rate for boys.   The live birth rate for boys was 55.3 percent compared to 44.7 percent for girls, which was surprising.

“So there’s about a ten percent gap which, again, we weren’t theorizing, we weren’t expecting,” said Dr William Schoolcraft, the Chief Medical Officer at CCRM.  “This study is unique in that it was the first large scale study to follow gender from conception all the way through live birth, “Dr Schoolcraft said.  “Understanding why we see an increase in female mortality in utero is important to public health,” he added.

In comparison, 51 percent of all babies born naturally in the US are boys.  Understanding the variance, could help lead to better overall success rates.    Doctors have theories involving X chromosomes, but say research is needed.

“I think it can help us understand some of the embryos that failed to implant, but I don’t think it’s going change the way we select embryos, I don’t think that would be correct,” said Dr. Schoolcraft.  CCRM is not in the business of sex selection, and doctors say infertility patients hoping for a chance to have a baby girl should not be discouraged.  There’s still a pretty good chance.

This study was presented at the annual conference of ASRM ( American Society of Reproductive Medicine) in mid October.