Ultrasounds and dating pregnancy

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.

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.When having a transabdominal ultrasound, however, a full bladder is necessary in order to “lift” the uterus up and out of the pelvis so the embryo can be seen more clearly.Later on as the pregnancy progresses, a full bladder is not necessary as the enlarging uterus is no longer contained in the pelvic rim.

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