Dating scan at 7 weeks

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


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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.

What to Expect with Ultrasound 7 Weeks in Pregnancy? - New Kids Center

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.

When is a dating scan necessary?

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. Later on as the pregnancy progresses, a full bladder is not necessary as the enlarging uterus is no longer contained in the pelvic rim. In very early pregnancy, the embryo and pregnancy sac may simply be too small to see very much at all.

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But with every day which passes, the embryo becomes bigger and more advanced in its development. At seven weeks of gestation it is still too early to identify what gender sex the baby will be. It is also impossible to do a thorough foetal screening assessment because it is still just too premature in terms of embryonic development.

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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. 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.

First Trimester / Dating Ultrasound

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.

The quality of the equipment and the skill of the sonographer are very important when doing any pregnancy ultrasound.

What to Expect with Ultrasound 7 Weeks in Pregnancy?

Like every other health professional, individual skill, expertise and training make a big difference to the outcome of their assessments. Your reasons for having an Early Pregnancy Scan are to: Early Pregnancy Scans are normally performed trans-abdominally through your tummy however an internal vaginal scan may be required at earlier gestations ie weeks to see all the necessary detail, or if your womb tilts backwards retroverted.

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We will always try to scan trans-abdominally first but if we need to do an internal scan then this will not be harmful in any way to the baby and would be discussed prior to having the scan. Ultrasound scans are painless but the gel used within the examination can feel a little cold and you may feel a little discomfort when the ultrasound probe presses on your tummy if you have a very full bladder.


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An ultrasound scan typcally takes approximately 10 minutes to complete and the images seen will determine whether a Trans-Vaginal ultrasound scan internal is needed. Your ultrasound scan will be carried out by one of our highly qualified professionals in a caring and comfortable environment. During your scan we will explain the findings to you and following your scan we will give you your images and detailed report.

If we cannot see a heartbeat then this is either due to the pregnancy being too early this is the commonest reason or that the pregnancy is found to be not viable. From this measurement we can work out how many weeks and days preganant you are this early measurement is approximate for dating.

At this stage often the baby can be seen making small movements usually past 8 weeks which are amazing to see. Early Pregnancy Scan Fee: A detailed report confirming all the scan findings and measurements will be produced including gestation and due date.

Suitable for storing maternity records and information leaflets. MUMS is a private pregnancy and scanning clinic, you can self-refer and arrange an appointment at your convenience. To book a pregnancy ultrasound scan please telephone us on: