BC has adopted a serum-based approach to prenatal genetic screening, with nuchal translucency (NT) added for women at higher risk of having a fetus with Down syndrome or trisomy 18 and women with multiple gestations. This guideline refers to screening options that are available in the public health care system, and is being progressively implemented as nuchal translucency (NT) ultrasound capacity develops throughout the province.
 
Guideline: Prenatal Screening for Down Syndrome, Trisomy 18 and Open Neural Tube Defects, January 2010
Reference card of key tables and flow diagrams.