Dating ultrasound at 8 weeks

There are two ways of having a seven week ultrasound.

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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.

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.

It is also impossible to do a thorough foetal screening assessment because it is still just too premature in terms of embryonic development.

However, general “mass” structures such as a head and body can generally be seen in the embryo at seven weeks.

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.

Crown/rump length and gestational age are closely compared with each other until around the end of the first trimester.

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