The nipt or harmony was £400 a couple of years ago when expecting ds. It’s 99% accurate and you can find out the sex if you want. In my area it can be done at the local hospital. There’s a bit of a controversy with it because in Iceland it’s done with every pregnancy and there’s now no one with Down syndrome as those pregnancies are aborted early. There were plans for it to be available on the nhs but it’s not happened yet as far as I’m aware.
The combined test you get at the nhs 12 week scan is about 75% accurate but how the baby appears on the scan gives some indication of any issues i.e. size and movement. They measure the neck and if that measurement is normal there’s a good chance baby is ok. I was only 40 when I had ds so the odds were much better then. We just decided if all signs were good with the combined test we’d assume all ok. I think I had a 1 in 2500 chance of a chromosomal abnormality when we got the result. Apparently age is part of the calculation they do to find out the odds so it’s more common to get a false positive for there being a problem if you’re older. I think it’s something like 1 in 250 or greater where they advise an amnio. Though my friend who had a high risk just had the nipt at that point as the amnio has a risk of miscarriage.
If you go for the combined definitely make sure you get it done at 12 weeks. If you are 14 weeks or more it’s a different test which is even less accurate. This happened to a friend who got given a late scan date as the hospital was busy. She was livid to be given a less accurate test.
I will definitely get the nipt because we just want to have an accurate picture of how baby is early on and the odds of an abnormality seem to go up steeply with age. I try to think though, although the odds go up it’s still relatively unlikely. If for example it’s 1 in 50 if you line up 50 mums only 1 would have the abnormality. Also there’s individual risk as well. Some couples will be less prone to an abnormality so the statistics can be misleading.
Obviously the nipt doesn’t mean you’re home and dry as there can still be problems at the anatomy scan at 20 weeks like heart defects etc but if baby is chromosomally normal a lot of issues can be treated.
I think it’s amazing that a blood test at 10 weeks can look at the baby’s dna. It’s so clever. Xx