Can you have a low NT measurement but still come back at risk on screening bloods?

[MinesALatte]

Just pondering after a very successful 12 week scan, the NT was 1.6mm and I had the screening bloods - just wondering if it can still come back with abnormalities despite the 1.6

I think it is calculated on a range of factors that also include age and also your blood test results for PAPP-A and HCG. I've heard of lots of older women who had great NT measurements but just due to age they then were given a high risk score

Yes!

My NT measurements ranged from 1.9-2.4 (baby was wriggling!) but when they ran that through the system with my bloods, I got a 1:27 risk for downs. We chose to then take the NIPT test and risk odds came back as 1:1,000,000. Felt like a lifetime waiting though!

Yes, as it's only one factor of a number they look at.
It's a good indicator though so I wouldnt worry unnecessary. Mine was 1.9mm and I'm 37 years old and I was low risk (around 1:8000)

I've heard of lots of older women who had great NT measurements but just due to age they then were given a high risk score

There is a lot more to it than NT measure and age. At 39 years old with a 1.7 measurement my results were 1:12262

They measure your hormone levels such as HG and Papp-a, and combine those levels with your age and NT measurement. Unusually low or high levels can raise your risk. But having a good scan and normal NT measurement is a great sign though! You would hear back very quickly if there was a high risk, within a few days. If all is well, you'll just get a letter through the post.
Congratulations on your pregnancy!

Thank you ladies! That’s all really helpful xx

I’m 34 and OH is 44 so not really sure where that puts me in terms of age and risk!

@WhatWouldPennyDo thank you for sharing your story, bet that was a long couple of weeks!

@MinesALatte hopefully everything will be ok for you. Generally there is an increase in the risk if you’re 35+ so being under that will help you. Good luck! Your NT measurement is great though, so definitely take some comfort from that (I won’t say ‘try not to worry’, as I know that’s impossible )

@WhatWouldPennyDo thank you! I’ll try not to worry... too much 😂😂

Both my pregnancies came back high risk despite good NT measurements at 12 week scan and I am under 30.

Both times I had a higher level of Hcg and a lower papp a level than what they deem to be acceptable. The first time I paid for a harmony which came back 1:10,000+ and baby was born with no issues. Second pregnancy was twins so they wouldn't do a harmony but CVS came back clear so it looks like that's just what my blood does. It's incredibly stressful though so I hope it comes back ok for you!

I was 36, nt measurement of 3.8 and after bloods given odds of 1:2 (very stressful few days!) Luckily everything was fine, even with those odds!