when can the nuchal fold scan be done
Nuchal scan The scan is carried out at 11–13+6 weeks pregnancy and assesses the quantity of fluid collecting within the nape of the fetal neck. There are two distinct measurements – the nuchal translucency, which is measured earlier in pregnancy at the end of the first trimester, and for which there is a lower threshold for increased diameter, and the nuchal fold, which is measured towards the end of the second trimester. The scan may also help confirm both the accuracy of the pregnancy dates and the fetal viability. As nuchal 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.[2]
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