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The 12-week scan, done between 11 and 14 weeks, measures the fluid at the back of the baby's neck as part of optional first-trimester screening and gives an early look at development.
Also called: NT scan, Nuchal translucency scan, 12 week ultrasound, First trimester screening, Combined first trimester screening
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What is a 12-week scan?
The nuchal translucency (NT) scan measures a small pocket of fluid under the skin at the back of the baby's neck. Combined with a blood test, your age and the baby's measurements, it gives a chance estimate for conditions such as Down syndrome. This is known as combined first-trimester screening.
The scan is only accurate within a set window, roughly 11 weeks to 13 weeks and 6 days, so timing matters. The sonographer also checks the heartbeat, early anatomy, the number of babies and the placenta.
Screening gives a likelihood, not a diagnosis. Some people choose NIPT (a separate blood test that looks at the baby's DNA in your blood) instead of or alongside this scan. NIPT is generally not covered by Medicare, and your doctor can help you decide which option suits you.
Why your doctor might request a 12-week scan
- Optional screening for chromosomal conditions
- Checking early anatomy and growth
- Confirming or refining the due date
- Checking twins, including whether they share a placenta
- Providing a scan alongside NIPT results
12-week scan: preparation, referral & Medicare
Preparing for your 12-week scan
- Book early so the scan falls inside the 11–14 week window.
- Have the screening blood test done beforehand if your doctor has requested it, usually from about 10 weeks.
- A partly full bladder may help; follow the clinic's instructions.
- Bring your referral, Medicare card and earlier scan reports.
How long it takes: About 30–45 minutes
Referral, Medicare & bulk billing
A referral from your GP, obstetrician or midwife is needed. The scan and the screening blood test usually attract a Medicare rebate, though many clinics charge an out-of-pocket gap for the scan. NIPT is a separate test that is generally not rebated. The clinic confirms billing when it accepts your booking request.
How it works
Get your referral
Most scans need a referral from your GP, specialist, or other health practitioner.
Compare clinics
Find clinics near you for your 12-week scan and compare bulk billing, reviews, and location.
Send your request
Share your preferred timing and send the clinic your details and referral when available.
Clinic confirms
The clinic reviews your request and confirms your appointment and any preparation needed.
If the clinic hasn’t acknowledged your request after 24 hours, Radly will follow up. We check in by SMS during daytime hours where SMS is available and you haven’t opted out. Reply N if you haven’t been contacted and our team will follow up. Acknowledgment does not mean an appointment is booked.
12-week scan FAQs
When is the best time for the 12-week scan?
Between 11 weeks and 13 weeks 6 days. Many clinics aim for 12–13 weeks so the baby is easy to measure.
Do I need the NT scan if I have had NIPT?
Many doctors still recommend an ultrasound at this stage to check early anatomy, the placenta and twins, even if NIPT is done. Your doctor can advise what suits you.
What happens if my result shows a higher chance?
Your doctor will explain the result and options for further testing. A higher-chance result does not mean the baby has a condition.
How do I book a 12-week scan online?
Choose a clinic on Radly, select Ultrasound as your scan, add your preferred timing and attach your referral, then send your booking request. The clinic contacts you to confirm the appointment and any preparation.
How soon can I get a 12-week scan?
Appointments for ultrasound are usually 1–3 days, depending on the clinic and the exam. You can send a request on Radly at any time, and the clinic replies with its next available time.
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