The information from this scan will give you a risk assessment for Down’s syndrome when it is combined with your blood results. We also assess your baby’s anatomy for this gestation and the placenta.

Consists of a trans-abdominal ultrasound scan plus a trans vaginal scan if required.

Trans-abdominal ultrasound scan. Some warm gel is applied to your lower abdomen and a probe is used to transmit ultrasound images to the screen for interpretation.

trans-vaginal (internal) scan may also be required to fully assess your pregnancy. You will be asked to empty your bladder and a probe will be inserted into the vagina as far as a tampon.

This additional technique can give extra information which may be critical in assessing the well-being of your pregnancy. A trans-vaginal scan is unlikely to be required at 12 weeks but we need you to be prepared for this possibility.

Why they are done

The scan involves a full assessment of the anatomy at this gestation, an assessment of the uterus, placenta and ovaries and the nuchal translucency measurement and nasal bone assessment.

The nuchal translucency is a thin layer of fluid at the back of the baby’s neck. When we measure this, the baby must be in a position the meet the strict criteria for measurement.

It can be time consuming to achieve this.

When they are done

These scans can only be performed between 11 weeks and 13 weeks 6 days.

The optimum time for the best view of your baby is 12-13 weeks so we recommend that you book for the scan then.

How long it takes

30 min


$60.00 there is no charge for follow up scans if required.

$75.00 which includes 2D movie clips and all images saved on a USB stick.

$150.00 which includes 3D imaging as well as short movie clips of the 3D and 2D scan, plus all the images saved on a USB stick.

How to prepare

Please arrive with a moderately full bladder. Drink 2 glasses of water 1 hour before your scan.

You must bring your referral with you. We cannot scan you without the referral from you doctor or midwife.

What to expect

The sonographer will discuss the results with you. These results will be with your referrer in 1-2 days.

If urgent the sonographer will phone your referrer.

The results of the scan will also be sent to the laboratory. They will combine the results from with scan with the results from your blood test. They will send your referrer a risk assessment in the form of a likelihood ratio on the chances that your baby may have a chromosomal abnormality like Down’s syndrome.

This is not a yes or no answer. If you wish to know with certainty then further invasive tests are required. Your referrer can discuss these with you.

For more information

National Screen Unit - Antenatal Screening for Down syndrome and Other Conditions

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