Understanding Your Screening Options
We'll discuss the options for screening for chromosomal conditions such as Down syndrome (Trisomy 21), Trisomy 18, and Trisomy 13, entirely your choice, at your own pace.
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Antenatal
Combined First Trimester Screening
Performed between 11 and 13 weeks + 6 days, this includes:
- A maternal blood test (ideally around 10 weeks)
- A nuchal translucency (NT) ultrasound scan (ideally around 12 weeks)
The results give a risk assessment rather than a diagnosis, reported as either low chance or high chance. If a high-chance result comes back, you may be referred to the Maternal Fetal Medicine team for further discussion and testing.
Non-Invasive Prenatal Testing (NIPT)
NIPT analyses fetal DNA from a maternal blood sample and is more accurate than combined screening, though it isn't currently publicly funded. The current cost is approximately $650. We recommend arranging NIPT through Wellington Obstetrics, as pre-test counselling and follow-up support are provided there.
Anatomy Scan (20 Weeks)
Around 20 weeks you'll be offered a detailed anatomy scan, which assesses:
- Your baby's growth and development
- Major organs and body structures
- Placental location
- Amniotic fluid levels
Most families choose to have this scan, although it remains entirely optional, like all of the screening on this page.
It's always your choice
Every screening test on this page is optional. We're here to give you clear, evidence-based information so you can decide what feels right for you and your whānau. There's no pressure either way.