Moonjellie
Member
From what I understand, it's a test for down syndrome only. They will do a blood test plus an ultrasound scan of the nuchal fold at the back of your baby's neck. Then they will tell you the results in ratios - 1:7000 babies etc. My doc says its considered a positive test if your ratio is 1:300 or less. Its not an absolute yes or no, but just an estimate.