St Vincent's Clinic Medical Imaging & Nuclear Medicine
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Prenatal Testing

Prenatal diagnostic procedures are performed as an outpatient procedure and you will be in our department for approximately one hour. Prenatal tests include:

  • Chorionic Villus Sampling (CVS) is performed to determine chromosomal or genetic disorders in the foetus. It entails getting a sample of the placental tissue for testing. CVS usually takes place at 14- 18 weeks after the last period.
  • Amniocentesis is a procedure used in the detection of chromosomal abnormalities and fetal infections, usually between 14 – 18 weeks after the last period. A small amount of amniotic fluid, which contains foetal tissues, is extracted from the amniotic sac surrounding a developing foetus, and the foetal DNA is examined for genetic abnormalities.
  • Nuchal translucency is performed between111/2 and 14 weeks of pregnancy and may involve both an abdominal and transvaginal ultrasound. It is used to assess the risk of Down Syndrome. If the risk is high, an amniocentesis or chrionic villus sampling may be offered.
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