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If you have agreed to have screening for Down's syndrome, the dating scan and the screening will usually happen at the same time.
Find out more about the combined screening test for Down's syndrome.
This is sometimes called a nuchal translucency scan.
The nuchal translucency measurement can be taken during the dating scan.
You won't be offered the combined screening test if your dating scan happens after 14 weeks.
Instead, you will be offered another blood test between 14 and 20 weeks of pregnancy to screen for the risk of Down's syndrome.
If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.
Its so common to lose between a few days to a few weeks at your dating scan.that came and went...left me to it eventually and phoebe was born on june 20th!!