Experts point out: embryo or fetal chromosome abnormality is the most common cause of early abortion, about 50%-60% is caused by "embryo" chromosome abnormality. The main reasons for the occurrence of fetal chromosome abnormality are the positive anti-embryonic antibody (greater than 1:64) and the abnormal intrauterine environment, such as mediastinum, fibroids, polyps and endocrine abnormalities. Exposure to ionizing radiation, chemicals, microbial infections, and genetics during pregnancy are secondary.
It is worth noting that chromosomal abnormalities leading to early abortion refer to chromosomal abnormalities in embryos, rather than chromosomal abnormalities in couples, which are normal in 99.99% of embryos. If a couple has one abnormal chromosome, the embryo does not necessarily have one. The reason for this can only be known when embryos are taken for chromosome culture during fetal instillation.
And a couple of common chromosomal abnormalities will not lead to habitual abortion, and chromosomal abnormalities are usually carry genetic type, namely the mild chromosomal abnormalities, such as balanced translocation, inversion [46, XY, t (5, 12)], such as the genetic information and a lot of, just chromosome fragment displacement occurs, such people and gonads appearance is normal, also won't lead to miscarriage, birth offspring chromosomes and made as at best.