11-13 weeks + 6 days.
The nuchal scan provides a screening for chromosomal abnormalities such as Down Syndrome and is combined with a blood test.
It is also the first opportunity to reliably examine your baby’s anatomy as it is fully developed at around 12 weeks.
Purpose Of The Nuchal Scan
A nuchal scan will:
- Check the viability of your pregnancy
- Confirm the number of babies
- Take measurements of your baby’s size which will date your pregnancy
- Screen for Down Syndrome, Edward’s and Patau Syndromes