What is nuchal translucency and how it can be seen?
Collection of the fluid under the skin of baby neck is seen as translucency in ultrasound.
Nuchal translucency can be seen between 11 weeks to 14 weeks of pregnancy.
It is also visible when baby size is 45-85 mm inside womb.
All the babies have some amount of fluid under the skin of neck, but baby with down
syndrome has more fluid.
Why to go for nuchal test?
NT is more of a screening test that estimates the risk of having downs syndrome. But it is
More accurate tests are chorionic villus sampling or amniocentesis. But these tests are
interventional and carry a risk. So they are performed in highly suggestive cases of
How this test is performed
Scan is done through tummy of a pregnant women. The person doing ultrasound put
some gel on tummy of woman, and press it little, and then move it over surrounding skin
to get view of baby inside. Person doing ultrasound will take
all the measures of baby, from head to spine, and will also see the fluid under the neck
How they calculate the risk of downs syndrome?
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