Alternatives to Amnio presents a few statistics that surprise me in some ways (but not in others):
Indeed, in a 1994 study of 161,560 fetuses, 86% of women who found out they were carrying a Down syndrome baby elected to abort [...]One potential downside of all the early screens is that they don’t detect other genetic abnormalities found by amniocentesis, including Klinefelter’s syndrome and Turner’s syndrome. About 50% of the time, a mother chooses to abort when an amnio finds those disorders, Dr. Wapner says, though both are less serious than Down syndrome. Klinefelter’s, which affects only boys, causes infertility, a feminized body shape and sometimes mental retardation. Turner’s syndrome, which affects only girls, results in a short stature, webbed neck and some mental retardation.