@Fizzl for what it's worth I don't think half the time the NHS screening is worth the paper it's written on! My nucal fold was bigger then yours , but I'd had the nipt test that is actually testing the babies DNA so I wasn't concerned. There are usually physical markers as well if they are worried so you honestly won't have anything to worry about. However the NHS test is not very accurate (79 percent) for the three screenings, however the nipt is 99 percent for down syndrome and 90 percent for the other two and it's actually testing their DNA rather then making an educated guess essentially like the NHS screening.
A good educated guess yes, but still a guess. It creates far more false positives then negatives so at least you can factor that into the 79% accuracy. It is dependant on your decision about down syndrome really as however it's packaged that is what the nipt is most accurate for and testing for.
The NHS test are only testing your blood for Papp A, which is an indicator for anomalies, but at no point are they actually testing the baby or babies inside you.
Very rarly happens but women who are given some ridiculous low odds, like 1 in a hundred thousand, will go on to birth a baby with downsydrome, and visa versa, a baby given a high chance, 1/20 for instance, goes on to have a baby without.
It's worth though remembering the nipt is not diagnostic, only amio or CVS are.
But there is very little room for false negatives and as far as I know the nipt does not give false positives.
It's expensive and 9 times out of ten unnnecesary, but for me personally with the twin factor I didn't want to spend my whole pregnancy worrying about something that would be an absolute life changing thing for my family. I wouldn't have continued with my pregnancy because of my other children and the impact disability would have had on them.
I didn't do the test for my single pregnancies as I was willing to trust in the system of the NHS more as well as them being my first two children so I could except a more high needs child potentially.
It should be the NHS test and they were going to roll it out before covid because it is so much more accurate, especially combined with the Papp a test and physical anomaly scan at 20 weeks.
Obviously there is controversy surrounding the harmony/nipt/panorama. Sally Phillips made a documentary on BBC called 'a world without downsydrome'. An interesting watch, though her own son with down syndrome has few physical problems and is high functioning on the spectrum of down syndrome itself.
Hope that information helps. If only the nipt was free!
Your results will be low risk I can tell you that now because the nucal fold is below their high risk category and your age.
It's about whether you want a more accurate result to go off and how your anxiety will be effected during the next 6 months. Mine would of been off the scale so I needed to do it for me. But it's a very personal decision, only you know how much you'll dwell on these things.