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Chorionic villi are microscopic finger-like projections that make up the placenta.
These tests are recommended based on your medical history, family background, a previous test result or results of a screening test.
These tests reveal the possibility or risk of a problem, but they do not provide a specific diagnosis.
First trimester screening is designed to identify women who may be at increased risk of having a baby with Down syndrome or trisomy 18.
Likewise, a negative screen does not mean the baby has no problems.
This screen is for specific birth defects but does not screen for all birth defects.
It involves a specific ultrasound measurement called "nuchal translucency" and a maternal blood draw.