Anyone with false negative NT screen

[zeospeed]

We've just had our NT scan at 12+4.

DS risk is 1 in 10000 (trisomy 18 and 13 risk less than 1 in 20000).. Has any one had a child with DS / chromosomal abnormalities with a risk this low ? I'm aware that it is a screen so of course there can be false negatives and positives. They did not mention if the nasal bone was not present however.

Many thanks

You cannot get a false negative or positive with the NT test. All it tells you is your chances of having a baby with this type of chromosomal abnormality. So if my chance was 1 in 1000 then of 1000 babies born, you would expect 999 babies would not have DS and one would. If my baby was born with DS given these odds, it would not mean that the test was wrong/falsely negative IYSWIM? All the test can tell you is how likely or unlikely you are to have a baby with DS.

Thanks apologies my question was phrased poorly. I guess what I meant to ask was has anyone with a 1 in 10000 NT/ b hcg/ ppa, screen had a child with chromosomal abnormalities? . I appreciate that statisticallly speak out of 10000 mothers with this risk one would have an anopleudic child, but just wanted to get a forum level of evidence .

I know two babies that have been low risk and have been born with ds. Don't know their numbers but were classed as low risk. I think that if you would terminate if your child did have a chromosomal abnormality then you should have a nifty/harmony or request more invasive testing from NHS. Clearly your risks are very low but there is always a risk x