Hi, I have gone through your question and understand your concerns. Trisomy 14 is a rare condition in which there are 3 chromosome 14 instead of 2 in each cell of the body. Such babies Mau have no major congenital anomalies which is visible in ultrasound, but they have problems in feeding, learning and socializing later after birth. However,chorionic villus sampling does not gives definitive diagnosis of trisomy 14 as some cells may be abnormal in placenta( confined placental mosaicism) while the fetus is normal. Even amniocentesis does not gives confirmatory diagnosis. I would suggest you to consult a fetal medicine specialist and get a chordocentesis at around20 weeks gestation, as it directly tests the blood from the fetus and gives definitive diagnosis. Further management has to be done accordingly. Hope you found the answer helpful. Please do get back for further queries. Wishing you good health. Regards, Dr Deepti Verma