Accuracy of dating pregnancy by ultrasound

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.Diagnostic ultrasound is a sophisticated electronic technology, which uses pulses of high frequency sound to produce an image.This imaging enables measurement of the fetus and estimation of the gestational age.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.

Later on as the pregnancy progresses, a full bladder is not necessary as the enlarging uterus is no longer contained in the pelvic rim.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.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.

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