In this add–on procedure, the provider uses either a transabdominal or transvaginal ultrasound to measure the fetal nuchal translucency, or the clear, fluid–filled space of the tissue at the back of a developing fetus's neck, for each additional fetus, during the first trimester. The aim of performing this ultrasound is to diagnose any abnormality or defect in the chromosomes of the fetus during development.
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