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How accurate are ultrasounds at predicting date of conception?

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Ultrasounds done before the 12th week of pregnancy are very accurate for dating purposes. They’re accurate to within 3 days. Any comments?

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Currently there are "8 comments" on this Question:

  1. Lovie says:

    How accurate are due dates predicted by ultrasounds? Your last known period date or the date of conception is a better predictor.as all babies are different

  2. Eileen says:

    The tests are normally right. Also what ur doctor is telling is right. they do the calculation based on babys development.

  3. Carole says:

    how accurate are doctors estimated conception :: baby measured 8 wks 6 date using ultrasounds? First ultrasound 9wks 1 day days Doctor ECD :: June 7th Sex on the 5th, 6th, a

  4. Lizabeth says:

    Your health care provider may order an ultrasound to more accurately determine your due date. More:http://www.chacha.com/question/when-an-ultrasound-is-done-to-predict-your-conception-date…-how-accurate-is-it

  5. Ji says:

    Conception dates are always close but usually are not accurate. It depends on if the woman remembers there last period because that is used to calculate the date. More:http://answers.ask.com/Health/Reproductive/how_accurate_are_conception_dates

  6. Syreeta says:

    %DETAILS% Answer Ultrasounds measure the size of the fetus to predict a due date and are usually very accurate, within two weeks, so I would safely assume that it would not be off by five weeks. You can ask your doctor, it won’t be the firs… More:http://wiki.answers.com/Q/How_accurately_can_an_ultrasound_determine_the_date_of_conception

  7. Piper says:

    Your health care provider may order an ultrasound to more accurately determine your due date.

  8. Shamika says:

    A fetal ultrasound is the most accurate way to determine the rough date of your Ultrasounds are useful in determining conception in early pregnancy, which Detail:http://www.ehow.com/facts_5379133_ultrasound-date-pregnancy-conception.html

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