Before revision: screen (four simultaneous blood tests) (maternal serum AFP, inhibin A, estriol, and βHCG) – elevations, low numbers or odd patterns correlate with neural tube defect risk and increased risks of trisomy 18 or trisomy 21 Ultrasound either abdominal or transvaginal to assess cervix, placenta, fluid and baby Amniocentesis is the national standard (in what country) for women over 35 or who reach 35 by mid pregnancy or who are at increased risk by family history or prior birth history.
After revision: screen (four simultaneous blood tests) (maternal serum AFP, inhibin A, estriol, and βHCG) – elevations, low numbers or odd patterns correlate with neural tube defect risk and increased risks of trisomy 18 or trisomy 21 Ultrasound either abdominal or transvaginal to assess cervix, placenta, fluid and baby Amniocentesis is the national standard for women over 35 or who reach 35 by mid pregnancy or who are at increased risk by family history or prior birth history.