These scans are to assess the growth of your baby, the placenta and the fluid around baby.

Trans-abdominal ultrasound scan plus a trans vaginal scan if required. Some warm gel is applied to your lower abdomen and a probe is used to transmit ultrasound images to the screen for interpretation. A trans-vaginal (internal) scan may also be required to assess the placental position or assess the cervical length.

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 but we need you to be prepared for this possibility.

Why they are done

The scan involves an assessment of the uterus and placenta and an assessment of some your baby’s anatomy. This includes the brain, heart and abdomen. We also measure your baby’s head, abdomen and leg (femur).

These measurements are used to assess the growth of your baby and are entered into a mathematical formula which will provide an estimate of the baby’s weight. We also check the amount of fluid around baby. Your midwife or obstetrician will enter these values into your customised GROW chart.

Sometimes we need to perform tests on the blood flow in the umbilical cord and in baby’s head. These are required in special circumstances and when baby is very small and not growing well.

We follow the protocols of the NZ Fetal Medicine Foundation.

When they are done

These scans can be ordered by your midwife at any stage from late second trimester.

If serial growth scans are required we cannot measure baby less than 2 weeks after the last scan when measurements were obtained.

How long it takes

20-30 min


$50.00 for each visit (2D scan only) or

$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.

Note: The quality of the images for 3D and 4D scans performed from 32 weeks onwards is greatly reduced, therefore purchasing this is at your discretion.

How to prepare

No preparation is required.

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 there are any concerns with your pregnancy the sonographer will phone your referrer and organise the report to be faxed urgently.

Want a cost effective package
deal for all your scans?

Ask about our Pregnancy Ultrasound Package

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