nuchal translucency
Pronunciation: NOO-kal trans-LOO-sen-see
An ultrasound measurement of fluid behind the fetal neck used for chromosomal abnormality screening.
Full Definition
Nuchal translucency (NT) is a specialized ultrasound measurement performed between 10-14 weeks of pregnancy to assess the risk of chromosomal abnormalities, particularly Down syndrome. The test measures the thickness of fluid accumulation at the back of the fetal neck. Increased NT measurements may indicate higher risk for genetic conditions or structural abnormalities. This measurement is often combined with maternal blood tests in first-trimester screening protocols and requires specific training and certification for accurate performance.
Usage
Usage note: Often abbreviated as NT. Measurements typically reported in millimeters. Part of combined first-trimester screening with maternal blood work.
In Context
- "The nuchal translucency measured 2.8 mm at 12 weeks, within normal limits for gestational age." — First-trimester screening report
- "Increased nuchal translucency prompted genetic counseling and consideration of diagnostic testing." — Maternal-fetal medicine consultation