If you are already pregnant, you will need to rely on your doctor's expertise and ultrasound testing to help you set a reliable due date. he is subtracting 14 days from this for a total of 266 days from conception (assuming day 14). He's showing that this 266 day total is incorrect, especially for primips.
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www.plus-size-pregnancy.org/figuring.htm
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Delivery took place within seven days of the due date for 49.5% of LMP due dates, and for 55.2% of ultrasound due dates. Delivery within ten days of the due date was 64.1% for LMP dates, and 70.3% for ultrasound dates.
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transitiontoparenthood.com/ttp/birthed/duedatespaper.ht...
transitiontoparenthood.com/ttp/birthed/duedatespaper.htm
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On the flip side, if your due date is put too early and you are pressured You can always resort to ultrasound later if there are facts that just don't...
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www.respectbirth.com/articles/determining-your-due-date...
www.respectbirth.com/articles/determining-your-due-date-without-ultrasound
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This is a discussion on MedHelp about CAN A ULTRASOUND BE WRONG ABOUT HOW LONG I AM PREGNANT? At this early stage the US could be incorrect. When they did my US at about 24 weeks, it said my due date was 11/20/93...
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www.medhelp.org/posts/Womens-Health/CAN-A-ULTRASOUND-BE...
www.medhelp.org/posts/Womens-Health/CAN-A-ULTRASOUND-BE-WRONG-ABOUT-HOW-LONG-I-AM-PREGNANT/show/28637
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If you're seeing a doctor or midwife with protocol about how many weeks they can let your pregnancy go (for many it isn't much past 40 weeks), then you don't want to take the chance that your due date is incorrect. Dangers of Ultrasound;
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www.bellaonline.com/articles/art45536.asp
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Answer to Women who deliver after their due date - normal or wrong due date? is mostly due to an incorrect date of last period, long menstrual cycle, etc. .... Where can I find a coupon code for Portable Ultrasound with multiple...
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askville.amazon.com/Early-ultrasound-key-correct-due-da...
askville.amazon.com/Early-ultrasound-key-correct-due-date/AnswerDetails.do?requestId=4921630&responseId=4921729
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Sep 7, 2009 A doctor predicts a due date by counting back three months from the was no shortage of old wives' methods and incorrect medical theories. or can't remember when the first date of her LMP was, an ultrasound is...
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www.wisegeek.com/how-do-doctors-predict-a-babys-due-dat...
www.wisegeek.com/how-do-doctors-predict-a-babys-due-date.htm
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When it comes to determining your due date, "things," as the Gilbert and Sullivan ditty goes, "are seldom what they seem." The methods of calculation are far from exact, common assumptions about the average length of pregnancy are wrong and calling it a Page Three: Learn how accurate ultrasound is at setting due dates;
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parenting.ivillage.com/pregnancy/0,,jb56,00.html
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Baby Jessica Darcy Lampf was delivered five weeks and four days early, despite her mother Therese repeatedly alerting staff at Our Lady of Lourdes Hospital in Drogheda that the incorrect due date had been entered in her file.
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www.independent.ie/health/parents-of-birth-date-error-b...
www.independent.ie/health/parents-of-birth-date-error-baby-may-take-legal-action-99306.html
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