'Well a definition of severe would help.'
But aren't some conditions on a spectrum (say, DS), making it difficult to determine how affected an individual will be?
Maybe we should look at this the other way around - why does the medical profession bother to scan and to test women pre-natally? Surely, it's just so they can determine whether the baby has any defects or not. And why give this information to a women if there is no choice attached to it?
I understand that some severe conditions are only detectable after 30wks+ (my friend's ds has such a condition, his brain cells didn't migrate post 30wks) BUT how many women are actually offered scans after 24wks? Certainly, my friend wasn't and she had no idea there was anything wrong with her ds until he was born or that his problems could've been detected on a late scan.
So, given that the NHS only offers scans at 20wks (except in those cases where a women has pre-eclampsia, her waters break early (that was me - I was scanned many times at 34wks), then just how many late onset defects are going to be detected anyway? If DS is picked up at the 20wk scan, then why would anyone who wanted to terminate wait until 39wks?
'My one area of pedantry'
Oooh, better not mention it again then!