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Prenatal Testing

Prenatal Testing. Screening for A typical Meiosis & Other Conditions. Prenatal Testing. A number of genetic disorders can be detected before birth. Testing for a genetic condition prior to birth is called prenatal testing .

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Prenatal Testing

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  1. Prenatal Testing Screening for Atypical Meiosis & Other Conditions

  2. Prenatal Testing • A number of genetic disorders can be detected before birth. Testing for a genetic condition prior to birth is called prenatal testing. • Testing for nondisjunction can be done as early as 8 weeks into a pregnancy

  3. Routine Tests • IPS – integrated prenatal screening: Combines results of ultrasound and blood tests • These tests do not indicate if the fetus has a particular condition, only if they have a higher risk • The most common conditions being screened for are: Down, Edward, Patau, and neural tube defects • Structural defects with organs may also be detected

  4. What if the screening is positive? • If desired, amniocentesis can be performed to determine presence of a chromosomal abnormality • If further testing yields a positive result, patients may be encouraged to meet with a genetic councillor

  5. Amniocentesis • A long needle is inserted into the amniotic sac • Fluid (which contains some fetal cells) is extracted and a karyotype is constructed from the cells

  6. Genetic Councilling • A genetic councilor is a medial professional that helps families make decisions about pregnancy, child care, and genetic testing • The councillor does not try to persuade the family one way or the other, they merely present the facts

  7. Ethical Issues with Prenatal Testing • Testing is rarely beneficial to the fetus • Amniocentesis can trigger a miscarriage (1/200) • False positive tests • Many conditions range in severity • Selection for gender or other traits may be possible

  8. CBC February 2012 • http://www.cbsnews.com/8301-505269_162-57382535/early-prenatal-test-raises-ethical-questions/

  9. Homework • Enjoy some quality time with your family 

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