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  2. Amniocentesis - Wikipedia

    en.wikipedia.org/wiki/Amniocentesis

    An amniocentesis is typically performed in the second trimester between the 15th and 20th week of gestation. [5] Women who choose to have this test are primarily those at increased risk for genetic and chromosomal problems, in part because the test is invasive and carries a small risk of pregnancy loss. [5]

  3. Prenatal testing - Wikipedia

    en.wikipedia.org/wiki/Prenatal_testing

    Since amniocentesis has approximately a 0.5% chance of miscarriage, one of those 200 normal pregnancies might result in a miscarriage because of the invasive procedure. Meanwhile, of the 3792 women told they are low-risk by the Quad test, 2 of them will go on to deliver a baby with Down syndrome.

  4. Prenatal sex discernment - Wikipedia

    en.wikipedia.org/wiki/Prenatal_sex_discernment

    A meta-analysis published in 2011 found that such tests are reliable more than 98% of the time, as long as they are taken after the seventh week of pregnancy. [1] [2] Chorionic villus sampling (CVS) and amniocentesis are two rather invasive testing procedures. These may, in principle, be performed as early as the 8th and the 9th week of pregnancy.

  5. Anomaly scan - Wikipedia

    en.wikipedia.org/wiki/Anomaly_scan

    The anomaly scan, also sometimes called the anatomy scan, 20-week ultrasound, or level 2 ultrasound, evaluates anatomic structures of the fetus, placenta, and maternal pelvic organs. This scan is an important and common component of routine prenatal care . [ 1 ]

  6. Testing Women, Testing the Fetus - Wikipedia

    en.wikipedia.org/wiki/Testing_Women,_Testing_the...

    Testing Women, Testing the Fetus by Rayna Rapp is a book, published in 1999, about analysis of the social repercussions of prenatal genetic testing.Rapp combines the data she collected herself with historical context of amniocentesis and genetic counseling to argue that amniocentesis and those abortions following positive test results is a social decision as much as an individual one.

  7. Percutaneous umbilical cord blood sampling - Wikipedia

    en.wikipedia.org/wiki/Percutaneous_umbilical...

    Fetal viability typically occurs at about 24 to 25 weeks of gestation. [2] When the fetus is in between the ages of 24–34 weeks, a glucocorticoid is given to the patient about 24 hours before the procedure to stimulate lung maturity. An ultrasound is performed before the procedure to view the position of the fetus and may be used during the ...

  8. Confined placental mosaicism - Wikipedia

    en.wikipedia.org/wiki/Confined_placental_mosaicism

    CPM is detected in approximately 1-2% of ongoing pregnancies that are studied by chorionic villus sampling (CVS) at 10 to 12 weeks of pregnancy. Chorionic villus sampling is a prenatal procedure which involves a placental biopsy .

  9. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...