07/22/2025
š¼ FirstāTrimester Screening at Chickadee Maternity Clinic
Expecting a little chickadee? As you enter the first trimester, we recommend exploring BCās prenatal screening optionsāavailable to all pregnant individualsāto support informed and confident decision-making.
What Does BC Cover?
⢠Firstātrimester dating ultrasound
Conducted between 11+0 and 13+0 weeks, this ultrasound confirms gestational age, checks for multiples, and measures Nuchal Translucency (NT), a key marker for chromosomal anomalies ļæ¼.
⢠Prenatal Genetic Screening Program
Through Perinatal Services BC (PSBC), BC offers provinceāfunded screening for:
⢠Trisomy 21 (Down syndrome)
⢠Trisomy 18
⢠Open neural tube defects (ONTDs)
Bloodwork is done in both first and second trimesters ļæ¼ ļæ¼ ļæ¼.
How FirstāTrimester Screening Works
1. Combined Screening (11ā14 weeks)
⢠Ultrasound measures NT.
⢠Blood tests assess PAPPāA and free βāhCG levels.
These measurements are combined with maternal age to estimate your babyās risk. This method can detect over 70ā80% of Down syndrome cases with low falseāpositive rates ļæ¼ ļæ¼.
2. NonāInvasive Prenatal Testing (NIPT)
A blood draw performed from 10 weeks onward analyzes cellāfree fetal DNA in maternal blood.
It screens with high accuracy (>99% for Trisomy 21) and no risk to baby ļæ¼ ļæ¼.
Note: This test may not be publicly funded for allāPSBC funds NIPT for individuals with elevated risk factors ļæ¼.
3. Invasive Diagnostic Testing
If screening indicates higher risk, you may consider:
⢠Chorionic Villus Sampling (CVS): performed at 10ā12 weeks.
⢠Amniocentesis: usually after 15 weeks.
Both provide definitive diagnoses but carry a small miscarriage risk ļæ¼ ļæ¼ ļæ¼.
Supporting BCāBased DecisionāMaking
⢠Genetic counselling is available through PSBC and BC Womenās Hospital, helping interpret results and options ļæ¼.
⢠HealthLink BC provides easyātoāread resources, including the NIPT overview ļæ¼.
⢠Fraser Health and other regional providers offer inādepth guides to prenatal blood testing and ultrasounds ļæ¼.
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Why Consider These Screenings?
⢠Early detection provides peace of mind or time to consider followāup options.
⢠Informed care enables tailored planning and increased reassurance.
⢠Holistic support through ultrasound, bloodwork, and counselling ensures a comprehensive understanding.
š Helpful BC Resources
⢠Perinatal Services BC: information on funded screening programs   
⢠HealthLink BC: details on cellāfree DNA testing ļæ¼
⢠BC Womenās Hospital: prenatal screening overview ļæ¼
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At Chickadee Maternity, weāre here to guide you through each stepāfrom ultrasound and bloodwork to thoughtful interpretation and personalized care. Want to schedule your screening or have questions about the process? Weāre just a flutter away. š