I got a quad screening at about 18 wks and I am not sure what they are measuring to come up with that. Is it common stuff in your blood that is believed to be an indicator that your child will have downs, or whatever else they tested for? It was all negative but I was just wondering.
There are alot of false positives with this test, however, if you test negative, you can pretty much relax. I was told that if you test negative, that the chance of the test being wrong is extremely unlikely. The test must be done before 20 weeks of gestation.
They always do the screening. Then at around age 35, they recommend an amniocentesis instead of the quad because your risk starts increasing for downs and by age 40 you have a 1 in 100 chance of having a downs baby whereas at 35 your chance is 1 in 350. I was 36 when I had my daughter, but refused the amnio because my quad was negative and I didn't want a needle going in my water bag.
You can decline the amnio, but I don't believe you can decline the quad. My doctor didn't give me the option. The quad also checks for abnormalities that can result in the baby not living or dying in utero such as anencepholy. IN this case, the baby wouldn't live outside the uterus or may die in utero, so the doctor would want to know as well as the mother.