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  • What We Screen For In Ontario
    • Trisomy 21 (Down Syndrome)
    • Trisomy 18 (Edwards Syndrome)
    • Nominate a Condition
  • Prenatal Screening Options
    • Is Prenatal Screening Right For Me?
    • Less than 14 Weeks' Pregnant
    • 14-21 Weeks' Pregnant
    • More than 21 Weeks' Pregnant
    • Twins and More Than Two Babies
    • Vanishing Twins
  • Results and Next Steps
    • Enhanced First Trimester Screening Results
    • Second Trimester Screening Results
    • Screening for Vanishing Twins Results
    • Non-invasive Prenatal Testing (NIPT) Results
    • 11-14 Week (Nuchal Translucency) Ultrasound Results
    • 18-22 Week Ultrasound Results
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  • For Providers-How to Order
    • enhanced First Trimester Screening (eFTS) Guide
    • Second Trimester Screening (STS) Guide
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HomeWhat We Screen For In Ontario
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A family being talked to by a doctor

What We Screen For In Ontario

Prenatal screening can tell you the chance for having a baby with certain chromosome differences. The conditions formally screened for in Ontario are: 

  • Trisomy 21 (Down syndrome)
  • Trisomy 18 (Edwards syndrome)

A screening test called Non-Invasive Prenatal Testing (NIPT) might also tell you the chance for having a baby with other chromosome differences,  including trisomy 13 (Patau syndrome) and sex chromosome differences. NIPT is OHIP-funded or paid for out-of-pocket, depending on the situation. 

scientist and helix

What does having a chromosome difference mean?

Inside each of the cells in our body, there are string-like structures called chromosomes. Chromosomes are made of DNA, and this DNA has the instructions that make you unique.

People with a chromosome difference have extra or missing chromosome material. This means that they can have problems with their health and ability to learn.  A chromosome difference can have severe effects for the baby and can even result in the loss of the pregnancy. 

Nominate a Condition

Have your voice heard! Did you know you can nominate a condition for addition to the prenatal screening program in Ontario?

    • Trisomy 21 (Down Syndrome)
    • Trisomy 18 (Edwards Syndrome)
    • 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 EST

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