1st dating scan

Posted by / 27-May-2020 10:54

This is because although every little embryo is unique, there are still defining characteristics of development which apply to all embryos at particular stages of early gestational development.As the embryo matures to a foetus, individual genetics and growth factors influence its growth.Crown/rump length and gestational age are closely compared with each other until around the end of the first trimester.The ideal time for a sonographer to assess the gestational age in the first trimester is between 7-10 weeks of pregnancy.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.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.

You probably have a whole questionnaire ready about the growth of baby, symptoms of pregnancy, dos and don’ts of pregnancy and whatnot.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.This is the period of time which provides the most accurate assessment.Generally, ultrasounds which are performed in the first trimester are within 3-5 days of being accurate in terms of assessing gestational age.

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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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