Combined Down Syndrome Screening (Nuchal Translucency Scan combined with a blood test)
The first trimester combined screening test is performed from 11+0 to 13+6 weeks. It confirms the viability of the baby, dates the pregnancy, giving an estimated date of delivery (an approximate due date) and also identifies multiple pregnancies.
It provides an opportunity to screen for chromosomal abnormalities (like Downs Syndrome) by measuring the nuchal translucency (fluid behind the baby’s neck). This measurement is combined with the results of your blood tests (from the mother’s blood sample) to give a risk assessment for Down’s syndrome (Combined Screening).