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At a Glance
Why Get Tested?
For pregnant women, to assess the risk of having a baby with certain chromosomal disorders, such as Down syndrome (trisomy 21) or Edwards syndrome (trisomy 18), or open neural tube defects, such as spina bifida
When to Get Tested?
Usually between the 15th and 20th weeks of pregnancy
A blood sample drawn from a vein in your arm
Test Preparation Needed?