1st dating scan

There are two ways of having a seven week ultrasound.One is via the abdomen – transabdominally and the other is through the vagina – transvaginally.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.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.

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But with every day which passes, the embryo becomes bigger and more advanced in its development.Like every other health professional, individual skill, expertise and training make a big difference to the outcome of their assessments.When you are first referred for a seven week ultrasound, the first of many types of ultrasound, ask your GP or maternity care provider who has the best reputation for quality scan results.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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