Patient's question:
The report shows Type 1 diabetes, Alpha-fetoprotein 46.00, Free B-HCG 30790, Trisomy 21 1/14944, Trisomy 18 1/4019, Open neural tube defect, and it was marked as low risk.Doctor's answer:
In normal pregnancy, a small amount of fetal blood cells, metabolic products, and proteins can pass through the placenta into the maternal blood circulation. Therefore, testing maternal blood and urine can diagnose certain genetic diseases of the fetus. At weeks 14–19, Down syndrome risk screening (excluding trisomy 21) is performed, and at weeks 20–28, a four-dimensional color ultrasound is conducted to exclude fetal abnormalities.