Nuchal translucency (NT) is a collection of fluid under the skin at the back of a baby's neck.
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A scan of the vagina may afford a more precise view of the baby, especially if the test is taken early, but most NT scans are taken through the abdomen.
Like with a dating scan, the sonographer measures the baby’s crown to rump length in order to calculate the baby’s age.
The nuchal translucency (NT) scan is a pioneering test that screens babies for Down’s syndrome during pregnancy.
It is currently the most accurate method for estimating the threat of Down’s without diagnostic testing.
However, diagnostic tests do carry a small risk of miscarriage.
An NT scan can't tell you for certain whether or not your baby is affected.
Before this the scan is difficult to do because your baby is still so tiny.
It would also be too early to combine it with your first trimester blood test.
Nuchal translucency is the fluid collected between two layers of the baby’s skin on the rear of the baby’s neck.