I was considered high risk in my current pregnancy and they did check for (and found) a nasal bone at 12 weeks on the NT scan.
The reason I am potentially high risk is because my son Logan (1 next week) has Down Syndrome and his condition went undetected. His nuchal fold measurement was 1.9mm and bloods were OK, the combined risk was 1 in 560 and his condition came as a terrible shock to us after he was born. I was 41 at the time. We very quickly did all the reading we could to get as much information on his condition as possible and have tried our best to give Logan the best in life that we can give him. We absolutely adore him and couldn't wish for a more loving and happy baby.
However, I had also had a miscarriage at 12 weeks in my first pregnancy (22 years ago) and had made up my mind before I went to Logan's booking appointment with the midwife that even if the 12 week scan came back as high risk I would refuse invasive testing as there is no way I would have risked a miscarriage.
On the day of Logan's diagnosis, my husband & I decided that we wanted a sibling for Logan as it would be such a shame for him to be an only child. We felt that both he and his younger sibling would get a lot from their relationship. In December last year, I fell pregnant but sadly had another miscarriage at 7 weeks in January. We conceived again in March and our baby girl is due on 3rd December.
In my current pregnancy, I also told the midwife at the booking appointment that I would refuse invasive testing, no matter what the 12 week scan results. I was automatically offered further tests because of Logan's condition, but refused anything that would increase the risk of miscarriage. My combined screening came back as 1 in 750 with a 1.4mm nuchal fold. I have had a detailed 20 week scan and a fetal echocardiogram and both have come back normal. I won't know for certain whether my little girl really is free of chromosomal abnormalities until she is born, but all the signs so far are looking positive. If she does have Down Syndrome, we will love her just the same anyway.
The decision as to whether to test or not to test further is a very personal one, and one that only you can make. I am not wishing to influence you in any way, but thought that I would let you know my personal experiences as you asked for any parents of children with Down Syndrome to reply.
Good luck, whatever you decide to do and I hope that everything turns out well for you xxx