NIPT wrong?

[Twopinkplease]

Yeah, a possible abnormality has crossed my mind, but I’m goig to stick with “hidden penis” until otherwise. I’ll see if I can get another ultrasound when I have my midwife appt next week - and see what they say!

Stupid hope!

Thanks everyone!

[atomic sagebrush]

I think that's much less likely. It's worth bringing up but please don't stress over it - not at all likely (and the NIPT chromosome test would detect most of those type of abnormalities anyway)

[2blue1pink]

While I was training at my current job I was once watching a complete anatomy scan another sonographer was doing. We were both ready to guess girl with about 80%...no penis anywhere in the 45 minutes she had been scanning and we saw a not perfect but pretty decent "3 lines"...right as she was about to tell them she was thinking it was a girl...out popped the baby's penis. It had been tucked tight between legs the entire time. It doesn't happen super often but there are some babies that can be tricky.

Follow up is definitely warranted though, talk to your medical provider. Also you may want to see if you have the actual results and what the % of sample they got was.

There is a test that isn't a real NIPT but is marketed as one for gender where people buy it over the counter and then it uses a finger prick of blood sample which is then mailed in to tell gender. I have heard/seen that test be inaccurate quite a few times (it only tells gender), it doesn't sound like that was the test you did (it's not through a doctor), but just wanted to throw that out there.

[atomic sagebrush]

Thank you so much 2blue - it is true that several people have told me they had a NIPT when they did the finger prick test this past two years. Agree that doesn't sound like what happened in this case but great catch - always worth mentioning.

[violagirl87]

Is it true that if you have had a boy previously then there is a chance that some Y chromosome could be in your blood still and that could lead to a boy gender in the NIPT test ? Doesn’t seem right to me.

I’ve also read that if the test is done too early and baby hasn’t developed their organs yet then if it’s a boy the Y chromosome won’t show up?

Idk neither one seems right....

Just wondering if anyone can help me clarify


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[atomic sagebrush]

They can tell the difference between the DNA from past pregnancies and current pregnancies. I can't find it now but I read about how they do it and I was satisfied by the process. It's 97-99% accurate for gender depending on what test you use.

You can have the test too early but my understanding is that it isn't about the baby's organs developing, it is the amount of comingling with your blood. Early in pregnancy the baby doesn't yet share your blood supply and the yolk sac is providing nutrition so there's not much of its DNA in your blood yet.

[violagirl87]

Thanks atomic!

I was thinking surely the genetic makeup of the baby is determined once the sperm and egg meet, and that’s why I was confused as to why it was necessary to wait until after 10 weeks (apparently that’s when the sex organs develop also) .

Makes sense now


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[atomic sagebrush]

Yes the genetic makeup is determined at conception. The confusion with the sex organs comes in because until about 10 weeks the Y chromosome is dormant, so both boy and girl babies look like girl babies on ultrasounds (often until the 13th week). But in their DNA they are still totally different and the NIPT can detect that regardless of what their genitals look like. Then, during the 10th week the Y chromosome "wakes up" and starts directing the body to make testosterone and it is testosterone that makes the genitals turn from what appear to be girl genitals, into boy genitals. The "clitoris" becomes a penis, the "ovaries" become testicles and a few other physical changes occur. But the recipe for all that to happen is set in the DNA at conception and can be detected in the mom's blood****** before the physical changes can be seen on ultrasound..

[violagirl87]

Hi TwoPinkPlease

I hope everything is going well for you. I was wondering what you found out about the discrepancy between your NIPT and your ultrasound?




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[atomic sagebrush]

yes we'd all love an update when you have a chance.