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Don't worry: This type of exam is painless and risk-free, and seeing your baby for the first time will likely be an enjoyable experience.

Naturally, one of the most common questions asked about ultrasound accuracy is: Just how accurate are the due dates that are predicted by an ultrasound?

If you can't remember your last menstrual period date or if you have consistently irregular cycles, the doctor can use an early ultrasound to give you a fairly reliable due date.

If your first ultrasound gives you a due date that is more than 1.2 weeks away from what was expected, there is a good chance that everything is still fine.

A recent article explained that doctors are now going to be using first trimester ultrasounds to determine due date in the majority of pregnancies.

Earlier this week the American College of Obstetricians and Gynecologists (ACOG) met with the American Institute of Ultrasound in Medicine and the Society for Maternal-Fetal Medicine to set new guidelines for due date determination. James Goldberg, vice chair of ACOG’s committee on obstetric practice, stated, “Some studies suggest up to 40 percent of pregnancies would have dates changed based on [a] first trimester ultrasound.” This difference is because most women do not know the day they conceive and the 40 week rule-of-thumb is based on a 28 day cycle, which is not always a good guideline for women with irregular or longer cycles.

Thanks :) Yea everyones growth rate is different but actual due date is given by measurements at a scan.

We luckily “caught the first egg” in both cases, so I had no last menstrual period to use in calculating a due date.Assuming that the subsequent ultrasound shows the expected fetal growth for the time period between the scans, your doctor may revise your due date to match the first ultrasound's predictions.And as long as the repeat ultrasound shows consistent growth and there are no signs of problems, there is no reason to be concerned if your doctor changes your due date.After 28 weeks, the ultrasound may be off by three weeks or more in predicting a due date.In order to use Medscape, your browser must be set to accept cookies delivered by the Medscape site.

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