This is between 11 weeks and 13 weeks plus six days, to be exact, or when your baby's crown rump length (CRL) is between 45mm (1.8in) and 84mm (3.3in).
So the NT scan will usually happen alongside your routine dating scan.
Sometimes, a scan can suggest that a baby has a high chance of having Down's syndrome, even though the likelihood is actually low. The false-positive rate for an NT scan is five per cent. Because the content you submit in the interactive parts of our site will be available to all our users and may be available to the general public, please do not provide personal or confidential information. Just got my scan on Wednesday and the NT was 3.09 and 3.04 all under 3.1 but my doctor still said that because its above three i have a 1 in 5 chance of genetic disorder.
This means that one woman in 20 is wrongly given a high-chance calculation. i dint understand because my blood tests both came back in the normal range.
She'll then measure the width of the nuchal fluid at the back of your baby's neck.
The skin will appear as a white line, and the fluid under the skin will look black.
Every woman has a chance of giving birth to a baby with Down's syndrome. A screening test tries to get a clearer estimation of whether your baby may have Down's syndrome. For example, if the result of your scan shows that you have a one in 1,000 chance, this means that for every 1,000 babies with your level of likelihood, one will have Down's syndrome. Diagnostic tests, such as chorionic villus sampling (CVS) and amniocentesis, can say for sure whether or not your baby has Down's syndrome.