(Closed) Is your doctor going by your missed period date or sono?

posted 8 years ago in Pregnancy
  • poll: Is your doctor going by your missed period or sono for your due date?
    Period : (24 votes)
    46 %
    Sono : (28 votes)
    54 %
  • Post # 3
    7586 posts
    Bumble Beekeeper
    • Wedding: December 2010

    My doctors went by my ultrasound and gave me a date of June 13th. Technically by missed period my due date would have been May 23rd. At 34 weeks they told me I was measuring ahead 3 weeks. Which would change my June date, from my first u/s, back to my due date from my missed period. They gave me another ultrasound and also said the baby is measuring ahead.

    So I’ve decided that they don’t really know either way and the baby will get here when he gets here lol.

    Post # 4
    1144 posts
    Bumble bee
    • Wedding: November 2011

    @luvalways86:  My doctor didn’t do a dating US so she is only using my last period.

    Post # 5
    5976 posts
    Bee Keeper

    My doc is going by my first day of my last period.

    You should be going by the first day of your last period, not when it ended…did your doc tell you that? The sonogram is accurate too though! Not many people give birth on their due date either.

    Post # 6
    3670 posts
    Sugar bee
    • Wedding: March 2011

    My doctor is going by the first day of my last period.  My 8 week ultrasound showed her measuring two days smaller but they just kept it since I was 100% sure of the first day of my period.  Now they’re saying she’s measuring a week ahead but they’re still maintaining the same due date. 

    Post # 7
    2137 posts
    Buzzing bee
    • Wedding: October 2012

    i was on the depo shot so i wasnt getting periods, the date on my ultrasound was july 5 but after when we had the gender ulstrasound they changed it to july 16 and i ended up having my bbygirl July 4th lol

    Post # 9
    5572 posts
    Bee Keeper
    • Wedding: June 2011

    My doctor goes by ultrasound dating for me but that’s just because I have really irregular cycles.

    Post # 10
    3771 posts
    Honey bee
    • Wedding: December 1999

    My doctors office said they go by LMP unless your dating ultrasound is off by more then 4 days and then they adjust.

    Post # 11
    228 posts
    Helper bee
    • Wedding: August 2010

    Mine was adjusted because the date going by my LMP was Dec 10 and the date based on the ultrasound was Dec 14. I know my cycles were longer than 28 days and am almost positive I didn’t ovulate until March 20, so that all seems to be in keeping with the second date.

    Post # 12
    1621 posts
    Bumble bee
    • Wedding: September 2012

    If your menstrual cycle was regular (whether 28 or 32 or whatever days) and you are certain of your last period (the first day), then setting the due date based on that is fairly accurate.  If an early ultrasound is done, it “agrees” if it is within 4-5 days of the LMP.  If not, the ultrasound dating is used.

    Once the due date is set, it shouldn’t be revised (under most circumstances) because after 12-13 weeks the baby’s unique genetics come into play, eg. tall parents will have tall babies that look “older” on ultrasound.  Plus, ultrasound dating gets progressively less accurate, up to 3 weeks inaccurate in the third trimester.

    Post # 13
    7295 posts
    Busy Beekeeper

    my doctor used my last period, but since my cycles were typically longer than 28 days, he said i may not be as pregnant as i think i am and we would see at the ultrasound.  At the u/s, the date they measured was only 3 days off so they said to just stick with my period calculation.

    ETA:  by period though, i meant we calculated due date by the date of the my last period i actually had, not the one i missed.

    Post # 14
    1660 posts
    Bumble bee
    • Wedding: October 2011

    At first they wanted to go by LMP, which put my due date at 12/10. But then they decided to go by ultrasound, which put my due date at 12/5.

    I was using opks and charting, and am pretty sure that based on ovulation my due date would be 12/6 or 12/7. I guess it doesn’t really matter!

    Post # 15
    2095 posts
    Buzzing bee
    • Wedding: September 2011

    I couldn’t remember the date of my last period so we went by the date of the ultrasound. I usually track my periods but it had been a crazy couple of months. I didn’t even realize I had missed my period until I was doing end of the month billing and realized I hadn’t gotten it that month.

    Post # 16
    5654 posts
    Bee Keeper
    • Wedding: April 2011

    We used my lmp because my dating u/s only changed the date by 2 days.

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