At a Glance
Why Get Tested?
To assess the risk of a foetus having certain chromosomal abnormalities, such as Down syndrome (trisomy 21) or Edward’s syndrome (trisomy 18).
When to Get Tested?
A blood sample taken from a vein in the arm. The results from the laboratory may be combined with the results from an ultrasound scan to improve the overall effectiveness of the screening test.
Test Preparation Needed?