dating someone who is bipolar - What happens at a dating scan

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.

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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 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.

Some sonographers believe that at seven weeks of gestation, transvaginal ultrasound provides the best and most accurate visualisation.

This is because the transducer does not need to send sound waves through multiple layers of muscle and tissue to “pick up” the returning images.

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.

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.

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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