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Nuchal translucency screening

NUCHAL SCAN for DOWN'S SYNDROME measures the amount of fluid at the back of your baby’s neck.The commonest genetic abnormality is Down’s syndrome, which occurs in approximately 1 in 600 pregnancies.The developing baby has an additional chromosome in each cell (chromosome 21), causing a wide spectrum of disability in affected children.


WHEN?: at 11-14 weeks of pregnancy


HIGH RESULT: If your risk is high (1: 300 or high) you may be offered a diagnostic test:

-chorionic villus sampling (CVS) (test between weeks 10 and 13) or

-an amniocentisis (test between weeks 14 and 20).





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