You can choose to have it or not. It will not tell you if something is wrong, only give you a risk ratio; so, even if you were to get, say, 1:3 that baby had, for instance, Down syndrome, it doesn't mean baby does have Down syndrome, it just means that you have a higher chance. At that point, the doctor would offer you either an amnio or cvs or you could choose to do one of the newer blood tests that test the fetal DNA for chromosome abnormalities. (MaterniT21, Panorama, Harmony). Fwiw, I'm not sure why people say the test gives a lot of false positives bc the test doesn't ever tell you that there is positively something wrong with baby, like I said above. It's only a ratio with a risk and even if the results were 1:2, you still have a 50% chance that nothing is wrong. I'll admit that it is stressful to get a risk, like 1:2 or even 1:11 like I got, but you just have to remember that that doesn't mean soemthing is definitely wrong.
I was high risk with daughter bc I was over 40. I had to meet with a genetic counselor too and it was the most stressful thing ever. I was told I had a 1:11 risk for trisomy 13 or 18 (both fatal) and a 1:17 for Down syndrome. Baby is healthy.
This is how I feel about the test: I think it's an opportunity to get more information about baby. I would never terminate a pregnancy and I see a lot of women list that as a reason for not having the test, but for me, it wasn't about that at all. I've always believed the old saying, 'knowledge is power', and I wanted to know so I, as well as my doctors, would be prepared if something were wrong. For instance, I was planning to deliver at a small community hospital. If baby had a problem that I knew about ahead of time I would have delivered at the larger hospital with specialists and a neonatal unit. Also, what if baby had a heart condition that needed immediate surgery after birth; I'd want to have been prepared for that. I jsut like being as prepared as possible. And yes, I know you can't always know everything and baby could still have been born with something that needed intervention, but at least I knew baby didn't have Trisomy 13 or 18, which was the most worrisome for me.
So really it's your choice. A lot of people are better off not knowing anyhting. They don't stress unless life gives them something to stress about. My sister is like that. Me, otoh, worry until I have info that lets me not worry. LOL So for me the test made sense. Oh, and sorry for the book