Its just a blood test. It looks for markers that increase your risk for birth defects, including downs. Just because you have markers, doesn't mean that your baby will have something. Its just a way they can gage how much more they need to do. Another thing they communally do is a measurment of the skin folds on the back of the baby's neck via ultrasound. Again, not a for sure way of saying if your baby has an issue, but just a step in deciding how in depth to go with testing
With DS1 I got talked into both... with DS2 and DD we did the quad... not that I'm at high risk for anything besides OI, but we just did it. Not sure if we will do it this time or not. I have a month or so to decide.
It's just a blood test. The ultrasound is the nuchal (NT?) screen. We don't do them, or any other genetic testing.
Katherine 7/5/02 Olivia 8/2/04 Freddie 5/31/07 Ellie 5/24/11 and Owen Benjamin 10/31/12
Ditto to above. We decline everything.