What is the normal threshold for the nuchal translucency measurement?

The nuchal translucency measurement is an important ultrasound marker used in the first trimester of pregnancy, particularly between 11 and 14 weeks of gestation, to assess the risk of chromosomal abnormalities, including Down syndrome. The normal threshold for nuchal translucency is defined as less than 3mm. Measurements equal to or greater than this threshold may indicate an increased risk for these conditions, prompting further evaluation or testing.

When evaluating this measurement, it's essential to accurately interpret its significance in the context of other factors, such as maternal age, family history, and the results of additional tests. This makes the understanding of the cut-off of less than 3mm vital for ensuring optimal prenatal care and risk assessment.