In Vitro Fertilization – The use of frozen eggs for assisted reproductive technique results in decreased live birth rates than the use of fresh eggs, according to a study.
The researchers analyzed the data from 380 fertility centers across the United States. They examined over 11,000 IVF procedures that used donor eggs in the year 2013. About 20 % (2,227) of the procedures used frozen eggs. The analysis discovered 47 % live birth rate with the use of cryopreserved ova as compared to 56 % when fresh oocytes were used.
“Our research demonstrated that frozen eggs offer a lower chance of pregnancy and delivery after IVF than fresh eggs,” said Dr. Norbert Gleicher, director at Center for Human Reproduction in New York. It is not known why frozen eggs resulted in fewer births but the scientists believe cryopreserved oocytes lost quality during freezing or thawing. The study had a setback that the ages of the donors or recipients were not known.
In the recent past, oocyte preservation has grown in popularity, in which a female’s ova are extracted, frozen and stored. When she is ready to become pregnant, the frozen oocytes can be thawed and fertilized via the standard In Vitro Fertilization (IVF). The fertilized egg or zygote is then implanted in the woman’s uterus, with the intention of establishing a successful pregnancy.
In the US, some fertility clinics and IVF centers have established frozen donor egg banks. People seeking the artificial reproductive technique should look at the different aspects of it before undergoing the procedure. Experts suggested that the patients should be openly informed about the pros and cons of fresh versus frozen eggs.
More than 7 million women in the US have ever received infertility treatment in their lifetime and one in eight couples have reported issues getting pregnant or maintaining a pregnancy. IMAGE/ CNN