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All pregnant women look forward to knowing the due date of delivery of the baby. A pregnancy ultrasound is a great option to determine the baby’s due date.

Ultrasound has become very helpful for obstetricians in predicting due dates and also diagnosing twins.

Therefore, for reference, doctors refer to the dates and measurements predicted by the first ultrasound due date as more accurate and correct.

After attaining 18 to 28 weeks of gestation, the margin of error can increase to one to two weeks minus or plus.

A marginal difference is found when cases of foetal ultrasound and menstrual history of the patients are compared.

Ultrasound has proven to be a useful test when the menstrual history is unknown, and one can safely calculate the expected date of delivery (EDD) by an ultrasound.

Though pregnant women are given a due date by the doctors, it is just a rough estimate as very few women deliver the baby on the due date.

The doctor may change the due date based on the result of the first ultrasound measurement which is fairly reliable.

It has commonly been observed that throughout pregnancy, each ultrasound shows a different due date.

Early pregnancy scans are more accurate than the latter ones for predicting the due date.

But the accuracy of the prediction by ultrasound keeps decreasing as the pregnancy progresses.

Hence the earlier the ultrasound is done, the more accurate is the predicted due date of delivery.

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