I would argue there is a point even if you wouldn't terminate, my situation was that the scan said we had a health baby but when combined with the blood test results our risk was increased. While the scan and blood test is primarily checking for markers for downs syndrome the results can also show other things. In my case it showed there was low protein a in the placenta.

Protein-a is a growth hormone and when the placenta is low it means the baby won't get as much growth hormone as usual ie resulting in a small baby. While only that is not an issue, what it also means is the placenta can stop functioning properly and the baby stops getting everthing it needs. In years gone by prior to the NT screening mothers still could get this problem but it was never detected and the result was still born babies. Thankfully due to us having the NT scan and blood test our OB knows of this issue and can closely monitor the babies growth so a decision can be made when the baby is better out than in. He has said he is hoping to get me to 34weeks.

So moral of the story is there are other benefits to these tests. While having low protein a is not common it is not uncommon my OB is currently treating 2 others with the same issue.