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Maternal Serum Screening

Down Syndrome, Trisomy 18 and Neural Tube Defects

Second Trimester Screening

Slide 14

March 2011

Second trimester screening using these 4 markers is the best option for women presenting for prenatal care later in the pregnancy.

Second trimester screening tends to have a slightly lower detection rate for Down syndrome compared to first trimester. In addition, since risk information is not available until the second trimester, the time for counseling and follow-up testing is limited.

Second Trimester Screening


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