positive genetic test- concerned!! please help!

Kristina
So I had the second trimester genetic testing done and my AFP MOM came back elevated at 2.68, so they called and said I have a increased risk for neural tube defect. I had to go get another level two blood draw today, has anyone had this happen and everything turn out fine? I'm just wondering why they didn't just do an ultrasound, is the blood test more accurate? Please help!