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7 Week Ultrasound
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.
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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. 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.
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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.
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. 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. In some respects the seven week ultrasound can be quite accurate because the embryo is developing very quickly.
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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. 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.
Early Pregnancy Scan (6 -14 weeks)
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