What to expect at dating scan

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 .
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This is a scan or ultrasound which determines your expected date of confinement EDC based on the development of the embryo. The limbs and the yolk sac, though obviously important, are not the primary means of measuring growth. An average length of the embryo at 7 weeks is anywhere between 5mmmm. The average weight is less than 1 gram. Obviously, every pregnancy is unique and individual factors influence the size of the embryo at this early stage, and the embryo shows development week by week.

The ideal time for a sonographer to assess the gestational age in the first trimester is between weeks of pregnancy.

Why would I have a dating scan?

This is the period of time which provides the most accurate assessment. Generally, ultrasounds which are performed in the first trimester are within days of being accurate in terms of assessing gestational age. This is because although every little embryo is unique, there are still defining characteristics of development which apply to all embryos at particular stages of early gestational development.

As the embryo matures to a foetus, individual genetics and growth factors influence its growth. This is why an early pregnancy dating scan, rather than one done in the later stages of pregnancy, is considered more accurate when assessing the expected date of delivery.

With maturity, the size of the baby correlates less to its age than in the early weeks. There are two ways of having a seven week ultrasound. One is via the abdomen — transabdominally and the other is through the vagina — transvaginally. Some sonographers believe that at seven weeks of gestation, transvaginal ultrasound provides the best and most accurate visualisation. With this form of scan it is not as necessary for the mother to have a full bladder. Once you have been given your expected due date at your dating scan, the next scan will be the week scan.

Log in to view your images online Search. Home What we do Obstetrics Dating Scan. This is an ultrasound scan that is performed early in the pregnancy. What to expect on the day?

Dating Scan

The scan takes 30 minutes to perform. You will be called by the sonographer who will take you to the scanning room. Please come with a full bladder which will make it easier to obtain images of the uterus. Risks Ultrasound is safe to use throughout your pregnancy.

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Benefits You will be able to get your expected due date of your baby on the day. You will be made aware if there is anything of concern on the day. If you have any questions you will be able to ask our on-site radiologist. Common questions about this scan What is an Ultrasound scan?

What is the purpose of the dating scan?

Will my baby be ok during the scan? Do I need to do anything before I have this scan? How long will the scan take? The scan will take up to 30 minutes on the day. What happens on the day? You will lie down with your tummy exposed and a towel tucked into your pants. The images of the examination will be provided on a USB stick for you to take away with you. I'm pretty sure you will always get a picture, the place I went printed one straight away, but be sure to ask. It is definitely a fair request! I'm pretty sure it's too early to detect any problems.


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As I said above, there may not be a heartbeat, which can be very scary, but they will suggest you come back for another scan later. Most problems are found at either 12 or 20 week scans - I think! If you have to have an internal again, so early, it's likely , you'll just take off everything from the waist down and cover with a sheet. Very, but you may be given a few dates! I've been given two so far - only three days apart, though. I had my first scan at 6w 5d. This was with my obstetrician. She said for earlier than 8w, she always did an internal scan.

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I saw the heartbeat and got given pics. I was fairly sure of my dates and she put me at 1 day further along, so pretty close. I'm now 9 weeks but had my dating scan at 7w4d. No need for an internal.. Was easily found externally. I don't believe you can hear the heart beat until weeks. I saw it at my scan but no audio. I got a disk with pictures. I think it's almost a given.


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  6. I wore a shirt and pants with a stretchy waist band. I was told 90 mins prior, empty bladder. Then drink 1 litre and hold it. It was so painful holding it.