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Not all areas offer this test as routine but when it is offered it is usually done at the 12-week scan.
The results of the nuchal test are put together with the results of blood tests that are usually done a bit earlier to screen for the risk of your baby having conditions such as Down's, Edwards and Patau syndrome.
Are you expecting just one baby, or could it be twins or (gulp) even more?
They will look at the placenta itself and will take note of its position, which may have implications for later in the pregnancy.You should then see the black-and-white image of your baby appear on the screen.The clarity of the picture depends on a number of things.You may also be offered a nuchal translucency test at this appointment.This is a measurement of the amount of fluid at the base of the baby's neck and it can indicate a higher risk of Down's syndrome.