Ultrasound accuracy in dating pregnancy
This creates error in that the baby will compute out to be further along than he or she really is.
Pregnancy ultrasounds are performed mainly using transabdominal ultrasound.
Even when the last period is known, ultrasound is reassuring to demonstrate adequate growth, especially when there’s a risk of delayed growth, as in hypertension or smoking, or if there’s the risk of exaggerated growth, as in gestational diabetes.In other words, by comparing your baby’s measurements to the data from this large collection of measurements, the ultrasound can then tell how far along your baby is.However, if you have a larger than average baby, the ultrasound will apply the husky figures to the “normal” measurements.If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.For transvaginal ultrasound you can have an empty bladder Dating scans are usually recommended if there is doubt about the validity of the last menstrual period.
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