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Category: Prenatal Testing

Asked by baby3tokrys

Q: Trisomy 21

What are normal odds of baby having trisomy 21? Went to the doctor today to get my NT results. He said mine were 1 in 935 of baby having trisomy 21. I am 33, is this a normal value? Kinda stressed out because he didn't really explain. He did say I wouldn't need to have an amnio though. So that is positive right?

This question was asked Jan. 19, 2015 11:34pm
Category: Prenatal Testing

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Answered by mirandacrowell - Feb. 2, 2015 8:52am

The NT ultrasound can't tell for certain whether your baby is affected. However, it can help you decide whether or not to have a diagnostic test. so, if your doc said "you dont need an amnio" than that means your results were good enough that he's not concerned!

i did an NT scan too. i just wanted the ultrasound, i didnt care about the results lol. but my doc just told me my result was negative for downs and trisomy 18. i didnt get a number or anything.

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Answered by mommyof2Nsky - Jan. 21, 2015 5:25am

i think were also 1 in 900 something, i got the results in email form, no one explained anything to me. i had to google it. doctors expect you to know everything they know... ugh.

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Answered by stillfuntryin - Jan. 20, 2015 9:55pm

I know two women who had there results come back less than 1 in 10!! Both babies checked out fine! There is a massive margin for error in these tests but it's also a better way than doing an amino because most would.opt not to, I'm 29.and min came back 1 in 16000 it doesn't make your baby more likely it's just a guude. Relax now you have a healthy bub on board!

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Answered by baby3tokrys - Jan. 20, 2015 9:48pm

Thank you so much for your response! After experiencing 3 miscarriages, pregnancy has been stressful enough already. That being said, I would love my baby no matter what, but I must say I am relieved. I was very frustrated with my doc, like I said, all he told me is I wouldn't need an amino. Thanks again for removing some unneeded stress!

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Answered by cosmoholic - Jan. 20, 2015 2:19pm

Any result on IPS screening over 1 in 200 is considered screen NEGATIVE for Trisomy 21 (Down's). So congratulations on a negative result (which is what you want on a test like this)!

I'm surprised he didn't go over your results in more detail! I'd be frustrated!

The Mount Sinai page has some good information about the tests - http://www.mountsinai.on.ca/care/pdmg/tests/ips

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