Accuracy of dating sonograms Cassi gaskins

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.Pregnant ladies and doctors find it more suitable to conduct ultrasound scans to assess the cervix, the passageway which opens up and reveals if labour is possible within a week.Estimating due date more closely helps the doctor take medical decisions.It mostly occurs in the first trimester in most cases where the dates differ by more than a week.If the repeat ultrasounds show the consistent progress of the foetus with no indication of any problems, then there is no reason to feel concerned if, for some reason, the doctor changes the due date.So, in the later stages of pregnancy, ultrasound measurements are invaluable in evaluating the baby’s growth over a period of time.

Generally, the physicians have no way to know the exact time of conception.

The accuracy of the ultrasound decreases as the pregnancy progresses.

An ultrasound can easily determine how far you’ve reached in your pregnancy.

The accuracy of determining the due date using LMP depends on regular cycles. The embryonic stage of development shown by scans is pretty uniform, and so it is more accurate to see each stage of the pregnancy through a scan.

Since LMP is completely an internal process, the body mechanism differs as the body is under stress, fever or flu.

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Therefore, pregnancy is calculated from the very first date of the last menstrual period.

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