Screening is often done by taking a sample of your blood between the 15th and 20th weeks of pregnancy.

These are called multiple markers. They give information about a woman's risk of having a baby with certain genetic conditions or birth defects. Second trimester prenatal screening may include several blood tests. Second trimester prenatal screening tests That may include chorionic villus sampling, amniocentesis, cell-free fetal DNA, or other ultrasounds. If the results of these tests are abnormal, your healthcare provider will suggest genetic counseling. When used together, these tests have a greater ability to find out if the fetus might have a genetic birth defect such as Down syndrome (trisomy 21) and trisomy 18. Abnormal levels are linked to a higher risk for chromosome problems.

This is a hormone made by the placenta in early pregnancy. This is a protein made by the placenta in early pregnancy. Pregnancy-associated plasma protein screening (PAPP-A). These tests measure 2 substances found in the blood of all pregnant women: Nuchal translucency screening uses an ultrasound test to check the area at the back of the fetal neck for extra fluid or thickening. Ultrasound test for fetal nuchal translucency (NT) Screening tests may be used alone or with other tests.įirst trimester screening has 3 parts. It can help find out the risk that the fetus has certain birth defects. First trimester prenatal screening testsįirst trimester screening is a combination of fetal ultrasound and maternal blood testing. These are some of the more common tests done during pregnancy.

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