Thanks. Are there figures for the false negative rate? I was struggling to find those.
It's certainly a reasonable option, but the context of the original comment saying that the parent would have known (or had the option to know) that the child had T18.
I didn't find false negative figures specifically mentioned as such for CVS or NIPT, only accuracy and false positive. I've assumed false negative == 100 - accuracy, but in reality results might also sometimes be "uncertain", which wouldn't count towards the false negative rate.
It's certainly a reasonable option, but the context of the original comment saying that the parent would have known (or had the option to know) that the child had T18.