A first trimester screening test checks for the risk of trisomy 21, 18 and 13 (Down syndrome, Edwards syndrome and Patau syndrome). Basic insurance covers the costs.
The test combines an ultrasound scan in the 11th to14th week of pregnancy to determine the nuchal translucency and screening of the mother’s blood. ‘Nuchal translucency’ refers to the fluid at the back of the baby's neck. The mother’s age and the information from the two blood tests are used to work out the likelihood of the baby having a chromosomal abnormality.
The test provides a risk assessment, not a diagnosis. Parents can use the result to help them make decisions about how to proceed.