Aneuploidy is a condition in which the number of chromosomes in the nucleus of a cell is not the same as the parents. An extra or missing chromosome is a common cause of miscarriages and genetic disorders including human birth defects such as Downs, Klinefelters, and Turners syndromes. For women who would like to wait until their late 30’s or early 40’s to have children the risk of Aneuploidy can exceed 10%. Egg harvesting in a woman’s early 20’s for use later in their reproductive lifecycle has demonstrated an effective means by which to significantly reduce this risk. A compelling paper describes the risks of pregnancy for women at the end of their reproductive lifespan due to a significant increase in the risk of Aneuploidy. (So I. Nagaoka, 2012).
So I. Nagaoka, T. J. (2012, July). Aneuploidy detection in assisted reproductive technology. Nature Reviews Genetics, 13, 493-504.