Chromosome examination is the main item of preoperative examination for IVF in the United States, especially for elderly women. We all know that pregnant elderly women have certain risks. Because the abnormal rate of chromosomes in eggs in the body is high, it will lead to infertility. Before the implementation of IVF technology in the United States, IVF surgery in the United States could only be carried out after dyeing inspection.

Chromosome examination can find the defects of chromosomes carrying human genetic code in female eggs. The wrong number of chromosomes in an egg cell may lead to embryo abortion or serious infant diseases, such as Down syndrome.

Up to half of young women's eggs and 75% of women over 39 will have chromosomal abnormalities. Analyzing the chromosomes of embryos before implantation in uterus and transplanting only embryos with normal chromosomes can effectively improve the success rate of IVF in the United States, reduce motivation, reduce the abortion rate, help families with high genetic risk to have healthy babies, avoid the birth of genetically abnormal babies and reduce birth defects.