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  2. Trisomy 18 - Wikipedia

    en.wikipedia.org/wiki/Trisomy_18

    Trisomy 18 occurs in about 1 in 5,000 live births, but more pregnancies are affected by the syndrome as the majority of those diagnosed with the condition prenatally will not survive to birth. [3] Although women in their 20s and early 30s may conceive babies with trisomy 18, the risk increases with age.

  3. What is trisomy 18 and why is it fatal? - AOL

    www.aol.com/lifestyle/trisomy-18-why-fatal...

    Another testing option is amniocentesis, which can be done between 15 and 20 weeks of pregnancy and involves taking a sample of amniotic fluid to test for trisomy 18 and other health conditions ...

  4. Triple test - Wikipedia

    en.wikipedia.org/wiki/Triple_test

    The most common abnormality the test can screen is trisomy 21 (Down syndrome).In addition to Down syndrome, the triple and quadruple screens assess risk for fetal trisomy 18 also known as Edwards syndrome, open neural tube defects, and may also detect an increased risk of Turner syndrome, triploidy, trisomy 16 mosaicism, fetal death, Smith–Lemli–Opitz syndrome, and steroid sulfatase ...

  5. Prenatal testing - Wikipedia

    en.wikipedia.org/wiki/Prenatal_testing

    In fact, consider that Down syndrome affects about 1:400 pregnancies; if you screened 4000 pregnancies with a Quad test, there would probably be 10 Down syndrome pregnancies of which the Quad test, with its 80% sensitivity, would call 8 of them high-risk. The quad test would also tell 5% (~200) of the 3990 normal women that they are high-risk.

  6. Living with trisomy 18: How a 6-year-old girl is beating the odds

    www.aol.com/living-trisomy-18-6-old-201618650.html

    Trisomy 18 typically results in life-threatening complications for a baby, but one little girl, Georgia, is proof of how one can live with it. Living with trisomy 18: How a 6-year-old girl is ...

  7. Triploid syndrome - Wikipedia

    en.wikipedia.org/wiki/Triploid_syndrome

    Triploid syndrome, also called triploidy, is a chromosomal disorder in which a fetus has three copies of every chromosome instead of the normal two. If this occurs in only some cells, it is called mosaic triploidy and is less severe. Most embryos with triploidy miscarry early in development.

  8. Nuchal scan - Wikipedia

    en.wikipedia.org/wiki/Nuchal_scan

    In another study values of 79.6% and 2.7% for the combined screening were then improved with the addition of second trimester ultrasound scanning to 89.7% and 4.2% respectively. [13] A further study reported detection of 88% for trisomy 21 (Down syndrome) and 75% for trisomy 18 (Edwards syndrome), with a 3.3% false-positive rate. [14]

  9. Elevated alpha-fetoprotein - Wikipedia

    en.wikipedia.org/wiki/Elevated_alpha-fetoprotein

    However, because AFP-based screening only has an 80-85% sensitivity for neural tube and abdominal wall defects, [2] many maternal-fetal medicine specialists and some obstetricians do not bother ordering an AFP test and instead perform detailed "Level-II" ultrasounds on all of their patients, which, in competent hands, results in a 97% ...