What happens at dating ultrasound

The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test".


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It involves a blood test and measuring the fluid at the back of the baby's neck nuchal translucency with an ultrasound scan. This is sometimes called a nuchal translucency scan. The nuchal translucency measurement can be taken during the dating scan. Find out more about the combined screening test for Down's syndrome.

What Happens At Ultrasound Appointments

You won't be offered the combined screening test if your dating scan happens after 14 weeks. Instead, you will be offered another blood test between 14 and 20 weeks of pregnancy to screen for the risk of Down's syndrome. This test is not quite as accurate as the combined test. Skip to main content.

First Trimester / Dating Ultrasound

Your pregnancy and baby guide. In some respects the seven week ultrasound can be quite accurate because the embryo is developing very quickly. They are also not as mobile and active as they will be with future development.

How accurate is a due date that is determined by ultrasound?

So obtaining accurate measurements and visualising them clearly on the screen is a little easier than when they are able to do somersaults and move around a lot. Yes, you should be able to. This is also more likely if you are having a transvaginal ultrasound. But by the time the baby has developed to full term, this rate increases to around BPM.

One of the reasons for this is because the heart needs to work harder and more efficiently to pump oxygenated blood around its much larger body and brain.


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The quality of the equipment and the skill of the sonographer are very important when doing any pregnancy ultrasound. Like every other health professional, individual skill, expertise and training make a big difference to the outcome of their assessments. When you are first referred for a seven week ultrasound, the first of many types of ultrasound , ask your GP or maternity care provider who has the best reputation for quality scan results.

You may also like to ask your friends who have had a positive experience and to see who they would recommend in terms of having firsthand experience. When an ultrasound is done between weeks of pregnancy, gestational weeks are considered as being within 10 days of accuracy.

There are many reasons why not. This applies at whatever stage of gestation the ultrasound is done.

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Join Huggies now to receive week by week pregnancy newsletters. Pregnancy Week by Week Take a look at each week of your pregnancy, from conception to birth, with our comprehensive email newsletters. Nuchal Translucency Ultrasound must be done between 11 and 13 weeks, six days.

Why would I have a dating scan?

If you choose to have this scan it needs to be done between 11 and 13 weeks to screen most accurately for any chromosome abnormalities, in conjunction with a blood test. There are some out-of-pocket costs associated with this scan, although a portion of it is covered by Medicare. The good news is, by this time external ultrasound is usually sufficient to see the baby, but the sonographer will still have to press down quite hard with the transducer to get a good picture.

This scan is definitely worthwhile, as by 12 to 13 weeks your baby looks much more like a baby.

When is a dating scan necessary?

I could see my baby rolling and waving her arms. Depending on your centre, there may or may not be a monitor visible to you. One in 1, or higher is considered low risk. Anomaly Ultrasound usually done between 18 to 20 weeks.

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