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Like every other health professional, individual skill, expertise and training make a big difference to the outcome of their assessments.

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Other reasons to have a 7 week ultrasound are to: The embryo will be measured from the top of its head, the “crown” to its bottom or “rump”.

This is because it is the longest portion of the embryo’s body and provides an ideal measurement baseline of growth and development.

This ten day “window” of days either side of the estimated date of confinement – the, is considered standard practice. Even with the best technology and most proficient sonographers available, ultrasounds do not provide absolute proof of dates, gender, size or the unborn baby’s status.

This applies at whatever stage of gestation the ultrasound is done.

At around seven weeks of pregnancy, it’s reasonably common for women to have their first ultrasound.

This can be for many reasons but the most common is to confirm pregnancy and to check that the embryo is viable and “everything’s ok”.

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.

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 5mm-12mm. 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.

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. This is also more likely if you are having a transvaginal ultrasound. 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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