Fetal RHD Screening – Results & Next Steps
Fetal RHD Screening (for RhD negative pregnancies)
Fetal RHD screening uses a blood sample from you to predict your baby’s RhD blood type. Results help determine whether you need RhD Immune Globulin (RhIG) during pregnancy.
Baby is RhD Positive
What it means:
Your baby is predicted to be RhD positive.
Next steps:
A healthcare provider will recommend RhIG to prevent complications in future pregnancies.
You will be offered RhIG:
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- At 28 weeks of pregnancy
- After delivery
- After any event where blood mixing may occur (such as bleeding, certain procedures, or trauma)
Baby is RhD Negative
What it means:
Your baby is predicted to be RhD negative, the same as you.
Next steps:
You do not need RhIG during pregnancy or after delivery, and you can continue with routine prenatal care.
Inconclusive or No Result
What it means:
The test was unable to provide a result.
Next steps:
A healthcare provider may:
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- Ask you to repeat the test, or
- Recommend RhIG and treat your pregnancy as if your baby is RhD positive
Contact Us
Prenatal Screening Ontario
CHEO Research Institute
Centre for Practice-Changing Research Building
401 Smyth Road
Ottawa, ON K1H 8L1
Information line
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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Virtual educational sessions on prenatal screening and nuchal translucency quality assurance are available upon request for health‑care providers.