A<unk>  or<unk>  translucency (NT) scan/procedure is a sonographic prenatal screening scan (ultrasound) to detect chromosomal abnormalities in a fetus, though altered extracellular matrix composition and limited lymphatic drainage can also be detected. Since chromosomal abnormalities can result in impaired cardiovascular development, a<unk>  translucency scan is used as a screening, rather than diagnostic, tool for conditions such as Down syndrome, Patau syndrome, Edwards Syndrome, and non-genetic body-stalk anomaly. There are two distinct measurements: the size of the<unk>  translucency and the thickness of the<unk>  fold.<unk>  translucency size is typically assessed at the end of the first trimester, between 11 weeks 3 days and 13 weeks 6 days of pregnancy.<unk>  fold thickness is measured towards the end of the second trimester. As<unk>  translucency size increases, the chances of a chromosomal abnormality and mortality increase; 65% of the largest translucencies (>6.5mm) are due to chromosomal abnormality, while fatality is 19% at this size. A<unk>  may also help confirm both the accuracy of the pregnancy dates and the fetal viability.
Nuchal scan
Birmingham gauge
MRI Robot
ShuntCheck
SNOMED CT
EConsult
Scan
VistA Imaging