This exam is performed between the 11th week and 1 day and the 13th week and 6 days.
Transabdominally.
Main role.
Screen for chromosomal diseases.
Calculate the risk that each woman has of having a baby with a chromosomal disease; combining ultrasound aspects (thickness of nuchal tranlucency, nasal bone, Doppler of the tricuspid), with the results of venous sampling, and maternal age.
This screening if well-performed has a sensitivity of 90%.
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At this time, a morphological study of the fetus can also be performed, in fact large structural anomalies can be diagnosed early.
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