PREGNANCY-BIRTH Messages for July, 2001: Re: Confused by due date.

Re: Confused by due date.

From: R. Daniel Braun, MD (anonymous@obgyn.net)
Thu, 26 Jul 2001 21:38:22 -0500 (CDT)

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In reply to: Kimberly: "Confused by due date."

At Thu, 26 Jul 2001, Kimberly wrote: >
>This is my second pregnancy, but I am confused by my due date. My LMP
>was May 2/01. I know that I conceived either May 16/01 or May 18/01. My
>midwife gave me a due date of Feb. 9/02. Now here's the confusion. I
>just had my 12 week ultrasound on July 24 or at 11w 6d. This ultrasound
>indicated that I was 12w 5d, and gave me a revised due date of Jan.
>31/02. In addition, my LMP date was noted as Feb. 6/02 - already
>differing by 3 days from my midwife's date of Feb. 9/02. I am unsure
>how to interpret these differing dates. I would appreciate some
>guidance on whether I should now consider my due date Jan. 31/02, Feb.
>6/02 or Feb. 9/02. The difference between Feb. 6 and 9th isn't a big
>deal, but from Jan. 31 to Feb .9 is a 10 day difference, thus my
>confusion.
>
>Also I have a second ultrasound book around 18 weeks, will this
>Ultrasound provide any more clues relating to the due date?
>
>Thank you!!

At 12 weeks US has an accuracy of plus or minus 7-10 days. Therefore if the ultrasound is within 7-10 days of what your LMP says, It CONFIRMS your LMP date and does not change it. With an LMP of 5-2-01, your EDC is 2-9-02. Another US at 18 weeks will only be accurate to plus or minus 14 days. at 30 weeks it is plus or minus 21 days and at 36 weeks it is plus or minus a month.. The first US is the most accurate US as far as dates are concerned. An accurate LMP confirmed by a 12 week US is excellent dating and should not be messed with.

--
R.Daniel Braun, MD  FACOG   FOG
**Note:  Opinions expressed here are for educational purposes only
and, as such, do not constitute a physician-patient relationship.
This information is not intended to supplant the need for you to
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Next message: R. Daniel Braun, MD: "Re: early ovulation"
Previous message: Megan: "Re: +ve hpt.....Megan"
In reply to: Kimberly: "Confused by due date."

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