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However, even a normal NT measurement would need to be considered with the blood test result and other factors, such as your age.
It's safe for you and your baby, and shouldn't be too uncomfortable either.
To date your pregnancy accurately, the sonographer will measure your baby from the top of his head to the bottom of his spine.
The baby with an NT of 6mm has a high chance of Down's syndrome, as well as other chromosomal abnormalities and heart problems.
It's rare for babies have as much fluid as this.
She'll then measure the width of the nuchal fluid at the back of your baby's neck.