Nuchal+

Earliest Week: 11
Latest Week: 13

Price:  £100

A first trimester ultrasound scan alone is used to assess the risk of Down’s syndrome and other chromosomal abnormalities. Risk is calculated using maternal age, the head to bottom measurement of the baby (dating scan) and the thickness of the fluid behind the baby’s neck. The overall Down’s syndrome detection rate is 71% and the false-positive rate is 2.4%.

Screen negative is a risk less than 1 in 300.