Help with chromosome errors

[nathanuk91]

Hi all,

My wife and I were told at our 12 week scan that our baby had a nt of 9.1. She then had a cvs and all the results came back clear. We had a early scan at 16 weeks and the nt was measured at 3.5. They also said nothing else looked concerning at this scan. We will have another 2 scans at 20 and 22 weeks. What I was wondering is what are undetectable chromosome issues. Know its a hard question. Sorry.

There are many but they're also rare in their occurrences so I wouldn't recommend stressing over that

That's a big discrepancy between NT measurements.

However, if it was 3.5 at 16 weeks, with a clear cvs, and nothing else looked concerning as you say, I would arrange a thorough developmental scan at 20 weeks, and leave it at that.

Only so many chromosome issues can be detected in utero. You could have further genetic testing done for the main ones, but I wouldn't bother at this stage as it won't tell you much. The 20 week scan will tell you about as much as can be known at this stage.

Wait for that and see what happens. If anything is picked up, you can go from there. But really, your situation sounds far from dire!

I say this as a mum of a child with a serious genetic condition that wasn't picked up until he was 4. There's no way to know with most chromosome issues unfortunately.