Early dating ultrasound due date accuracy - How accurate are 'due dates'?

You can calculate your due date by subtracting three months from the first day of your last menstrual period LMP and then add a week. Use our pregnancy calculator....

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Pettker, MD; James D. Goldberg, MD; and Yasser Y. This document reflects emerging clinical and scientific advances as of the day issued and is vassal exposed to to change. The bumf should not be construed as dictating an snobbish course of treatment or procedure to be followed. Accurate dating of pregnancy is important to fix up outcomes and is a research and public vigor imperative. As soon as data from the conclusive menstrual period, the opening accurate ultrasound examination, or both are obtained, the gestational age and the estimated due date EDD should be determined, discussed with the patient, and documented clearly in the medical record.

Subsequent changes to the EDD should be reserved for rare circumstances, discussed with the patient, and documented unquestionably in the medical notation. When determined from the methods outlined in that document for estimating the due date, gestational period at delivery represents the best obstetric estimate as a service to the purpose of clinical care and should be recorded on the ancestry certificate.

MFM mums share their stories plus expert sonographers explain why it happens and what to do if you're told your due dates are wrong. Original date given was 18 December but at the scan it was moved to 31 Dec. It just doesn't quite add up by my reckoning of when I think I ovulated and when I know we did the deed! Unless you have an early pregnancy scan most of you will be given your estimated due date at the week scan. Of course you have probably already used an online due date calculator.

This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started your LMP.

It's because it gives a definite date for health professionals to work with. There would be so many variables if it was calculated from when you think you conceived, especially as everyone's cycles are different and the fact that you don't necessarily conceive on the day you have sex! But this will only give you a rough idea. This is especially true if you have an irregular cycle or have been on the Pill for example. Experts say that the scan date can sometimes come out as less pregnant than suggested by your LMP.

But then again with my first baby I was spot on with dates, he always measured big and he was a week overdue

I'm a first time mom and according to my last menstrual period, I'm due on September 16th.
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For the purposes of research and surveillance, the best obstetric estimate, rather than estimates based on the LMP alone, should be used as the measure for gestational age. By my lmp I should have been due the 5th. Pettker, MD; James D. My son was 8 days late so I knew this one would be too.

Because decisions to change the EDD significantly affect pregnancy management, their implications should be discussed with patients and recorded in the medical record. You can calculate your due date by subtracting three months from the first day of your last menstrual period LMP and then add a week.

  • Sometimes the due dates estimated by an early ultrasound don't match...
  • Had a pregnancy ultrasound that doesn't match your Estimated Due Date (EDD)? MFM Unless you have an early pregnancy...
  • Accurate dating of pregnancy is important to improve outcomes and is a research As soon...
  • The most accurate time is between 8 and 11 weeks gestation. The EDD from the early dating...
  • Remember to not climb onto your roof until down to the ground mandatory.

  • Dating your Pregnancy | The MotHERS Program™
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This is where you discover that your due date isn't based on the date you conceived, it's actually calculated from when your last menstrual period started your LMP. So is the ovulation test more accurate or the ultrasound? Ultrasound Obstet Gynecol ;4: Use of this Web site constitutes acceptance of our Terms of Use. Enter Now View All Competitions.

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