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  • What is Prenatal Screening?
    • What Do We Screen For?
    • Multiple Marker Screening (MMS)
    • Non-Invasive Prenatal Testing
    • Nuchal Translucency Ultrasound
    • Options by Pregnancy Stage
    • For Twins or More Than Two Babies
    • Nominate a Condition
  • Results and Next Steps
    • Multiple Marker Screening (MMS) Results
    • Non-invasive Prenatal Testing (NIPT) Results
    • Diagnostic Testing
  • Requisitions and Provider Tools
    • Multiple Marker Screening (MMS) Requisitions
    • Non-invasive Prenatal Testing (NIPT) Requisitions
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HomeWhat is Prenatal Screening?Options by Pregnancy Stage
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Screening Options by Pregnancy Stage

Prenatal genetic screening is a way for you to determine the chance your baby may or may not have trisomy 21 (Down syndrome) or trisomy 18. Sometimes prenatal screening can tell you about the chance for other genetic conditions, such as trisomy 13 and sex chromosome differences. 

Prenatal genetic screening consists of ultrasound and bloodwork which can only be done at certain stages in the pregnancy.  You may refer to this timeline which shows when prenatal genetic screening and diagnostic tests are available over the course of a pregnancy. 

Below you can find more information about your prenatal screening options, depending on how far along you currently are in the pregnancy. If you are expecting more than one baby (for example, twins or triplets), please visit our page on multiple gestation pregnancies. 

 

first trimester embryo
Less than 14 weeks' Pregnant
Second trimester fetus
14-21 Weeks' Pregnant
Third trimester fetus icon
Greater than 21 Weeks' Pregnant
  • What is Prenatal Screening?
    • What Do We Screen For?
      Toggle Section What Do We Screen For? Menu
      • Trisomy 21 (Down syndrome)
      • Trisomy 18
      • Trisomy 13
      • Sex chromosome differences
    • Multiple Marker Screening (MMS)
      Toggle Section Multiple Marker Screening (MMS) Menu
      • Enhanced First Trimester Screening (eFTS)
      • Maternal Serum Screen (MSS)
    • Non-Invasive Prenatal Testing
      Toggle Section Non-Invasive Prenatal Testing Menu
      • NIPT Funding Criteria
    • Nuchal Translucency Ultrasound
      Toggle Section Nuchal Translucency Ultrasound Menu
      • Increased Nuchal Translucency
    • Options by Pregnancy Stage
      Toggle Section Options by Pregnancy Stage Menu
      • Less than 14 Weeks' Pregnant
      • 14-21 Weeks' Pregnant
      • Greater than 21 Weeks' Pregnant
    • For Twins or More Than Two Babies
    • Nominate a Condition

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Prenatal Screening Ontario 
CHEO Research Institute 
Centre for Practice-Changing Research Building 
401 Smyth Road 
Ottawa, ON K1H 8L1

Phone: 613-737-2281

Toll-Free: 1-833-351-6490

Monday to Friday, 9:00 AM to 3:00 PM

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