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February 2015 Moms
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How accurate are ultrasounds

rockurocku member
in February 2015 Moms
My first ultrasound said I was 6 weeks which was 2 days off from my lmp. My second ultrasound came back 12 weeks which was right where i was supposed to be. Third ultrasound said 19 weeks which is also right where I was supposed to be. How accurate are early ultrasounds?
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Re: How accurate are ultrasounds

  • maltwin1maltwin1 member
    was the second ultrasound done about 6 weeks after the first one? and then the third done 7 weeks after that?

    If you had 3 right in a row, was there a reason? I'm going to need a little more information
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                                     **DS 12/17/10** **#2 Due 2/14/15**

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  • rockurocku member
    Sorry yes the second ultrasound was done about 6 weeks after the first, and then the third 7 weeks after that.
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  • chicagojackiechicagojackie member

    first trimester ultrasound is the gold standard and is expected to be within 5-7 days of the due date. crown-rump length is used.

    scans later than 12 weeks have an error margin of 10-14 days, even later. This is why later scans are not used to re-date a pregnancy.

    BFP #1: It's a GIRL! DD born October, 2012
    BFP #2: m/c at 7w, February, 2014
    BFP #3: It's a BOY! Please be our rainbow! Due February, 2015
    *everyone always welcome*
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  • kefttsckefttsc member
    Were you charting?  Do you know your ovulation date?  Your LMP often means nothing at all.  

    For instance, my LMP was May 5, but I know I didn't ovulate until CD16 of my normal 28 day cycle because I was charting.  


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    MMC October 2010
    BFP #2 June 3, 2014
    Twins?  You mean two babies?  WOW!
    Team PURPLE!!
    We are excited to meet William Alexander and Harper Abigail in 2015!
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  • maltwin1maltwin1 member
    As long as you are measuring normally and right on track, I wouldn't worry over your very first ultrasound too much. I'd say only a two day difference at 6 weeks is pretty darn accurate.
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                                     **DS 12/17/10** **#2 Due 2/14/15**

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  • StephanieLBergStephanieLBerg member
    If you're measuring on schedule now, then why even worry about 1 or 2 days difference on your first scan? My first scan measured right +/- 1 day from my LMP, my second scan measured a week over, and my third scan measured right on track +/- 1 day. You're never going to know your EXACT due date as rarely do babies come on time. If you were measuring more than a week behind, then I'd be concerned, but 1 or 2 days off from your LMP? What are you so concerned about?
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  • Beth.1212Beth.1212 member
    The earlier the ultrasound, the more accurate for dating purposes. 

    I wouldn't worry about a couple of days here and there. I'd expect to deliver between 38-42 weeks, so 2 days difference is nothing. 
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