theres a chemical in your blood that the levels will show if the baby is at risk or not when i went for the nuchal scan at 12 weeks 5 days. they told me he was increased risk 1 in 251. they did the other blood test that is more expensive but insurance wont cover unless there is a increased risk. after that one i was told 1 in 1,000 very low risk. I had my anatomy scan at 21 and he said no defects as far as they can see. =]
They do the amniocentesis if the first test comes back saying you're at elevated risk. Your can opt out if that one if you don't want to go that far. If my initial test came back with concern I wad going to pass on the amnio.
Is just two blood tests and an ultra sound. I opted for it just becauseI wanted to see baby again before my 20 week ultra sound :)
I thought genetic testing was done by chorionc villus sampling or amniosintiesis which is when they take dna from ur placenta or amniotic fluid.. I've had both done as i have two children withh cystic fibrosis. I'm nnot sure if they can do it by blood tests? I know that ultra sounds can pick up spinabifida and down syndrome. But i don't know. do u have any chronic diseases that run in ur family? Usualy the doctor willl suggest it based on ur family history.
I got it done just in case something was up I could prepare for it.
I've always declined the genetic testing, there are a lot of false positives that just worry people and there's not much you can do to know for sure anyways. My nephew had down syndrome, and they were able to detect that through ultrasound. Mostly because he had a hole in his heart which is pretty common with downs, and done proportions in his bone sizes were a but off. But even then they werent really sure if he would have it or not until he came out.
Genetics testing will see if there are any genes you could pass down to your baby that could carry diseases.
If you're in your first trimester or early in your second, they will offer you tests that will check for down syndrome and things.
You can decline it, I declined mine.