Expert Information for Parents On-Line
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PRENATAL DIAGNOSIS-AMNIOCENTESIS

INFOPARENTS.COM: Prenatal diagnosis is the term for tests that try to determine if an unborn baby has any birth defects. About 2 to 3% of babies born have some type of major birth defect, mostly due to a chromosomal defect or abnormality. One of themost common problems is Down's Syndrome or Trisomy 21, where the baby has 3 chromosome 21's rather than 2.Many of these chromosomal problems result in a severely affected baby or one which does not survive even to delivery. The incidence of Down's Syndrome and other chromosomal problems increases with age:

  • At 20 years of age the risk of giving birth to a child with Down's Syndrome is 1 in 1,667
  • At 25 years the risk is about 1 in 1,250
  • At 35 years the risk is about 1 in 200.
  • At 40 years the risk is about 1 in 106.

    What is Amniocentesis

    An amniocentesis is a test in which collects fluid surrounding the un born baby. under ultrasound, a needle is inserted into the uterus, through the mothers, abdominal area. The fluid is then collected. the fluid contains cells form the baby and can also be helpful if analysed for certain specific substances. Usually an amniocentesis is offered to women over 35 years of age, or to women who are at high risk for having a baby with a birth defet. An amniocentesis is usually performed at 15 weeks gestation and carries a risk of losing the pregnancy of about 0.5%.

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    The information provided above is designed to be an educational aid only. It is not intended to replace the advice and care of your health and/or allied health professional, nor is it intended to be used for medical diagnosis or treatment.
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