Use of donor eggs to get pregnant rises
But study shows ideal results are still uncommon
CHICAGO — U.S. women are increasingly using donated eggs to get pregnant, with often good results, although the ideal outcome — a single baby born on time at a healthy weight — is still uncommon, a study found.
That ideal result occurred in about 25 per cent of donor-egg pregnancies in 2010, up from 19 per cent a decade earlier, the study found.
Almost 56 per cent resulted in a live birth in 2010. Although most of these were generally healthy babies, 37 per cent were twins and many were born prematurely at low birth weights. Less than one per cent were triplets. Low birth weights are less than about 5 1/2 pounds; babies born that small are at risk for complications including breathing problems, jaundice, feeding difficulties and eye problems.
For women who use in vitro fertilization and their own eggs, the live-birth rate varies by age and is highest — about 40 per cent — among women younger than 35.
Women who use IVF with donor eggs are usually older and don’t have viable eggs of their own.
Because the donor eggs are from young, healthy women, they have a good chance of success, generally regardless of the recipient’s age.
The average age of women using donor eggs was 41 in 2010 and donors were 28 — those numbers didn’t change over 10 years.
The study, by researchers at Emory University and the federal Centers for Disease Control and Prevention, was published online Thursday in the Journal of the American Medical Association and presented at the American Society for Reproductive Medicine’s annual meeting in Boston.
IVF involves mixing eggs and sperm in a lab dish and transferring the resulting embryo to the woman’s womb a few days later. It’s most often used with the woman’s own eggs, in cases of infertility.
The study found attempts using donor eggs increased over the decade to 18,306 from 10,801. Transferring just one embryo, to avoid multiple births, also increased, to 15 per cent from less than one per cent.
Lead author Jennifer Kawwass of Emory University said researchers still need to find better ways to identify which embryos have the best chance of resulting in healthy babies.