Abstract
Improved ultrasound resolution and continuing attempts to detect congenital abnormalities and chromosomal aberrations in early pregnancy have led to the use of nuchal lucency as a marker for such conditions in the first trimester. Current research has shown the importance of increased nuchal lucency (greater than 3 mm) as an identifying risk marker for aneuploidy and, in the presence of normal karyotype, additional anatomic anomalies.
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