Second trimester maternal screening

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Also known as: Triple test; quad/quadruple test

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?

In most centres women will be offered first trimester screening between 11-13 weeks, although for some it may be carried out in the second trimester, usually between 14 and 20 weeks of pregnancy.

Sample Required?

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?