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December 2010 Moms
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ultrasound dating... and stress

lderealderea
in December 2010 Moms

hey all- 

 

So 4 weeks ago I went for the anatomy scan and my little boy measured 19 weeks 3 days instead of 20 weeks 2 days.  When I went for the next doctors check up the nurse practitioner who I saw told me to get a fetal growth ultrasound 4 weeks from the last one, just to make sure the growth was on par.  Otherwise, everything looked very healthy.  

So I go today and the baby is only measuring 22 weeks and 5 days.  In 4 weeks, it had only grown 3 weeks and 2 days.  There is no on-site doctor so I need to wait till my doctor gets the results tomorrow to talk to a doctor about it.

Obviously, I am freaking out.  My baby is super active, and seems healthy, but everyone comments on how "tiny" I still am.  When I googled "how accurate is ultrasound dating"  I found a Medscape article that states that past 20 weeks, ultrasound dating can be off up to 8-10 days and isn't a very accurate form of dating at the point.  

 Has anyone gone through something similar?  Does this just mean that I'll have a smaller 6 lbs baby than a 10 lb baby?  I know that no one here is a doctor, I am just looking for ppl with similar experiences till I can talk to my doc tomorrow. =)

 

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Re: ultrasound dating... and stress

  • LovesMMLovesMM member

    After the 1st Trimester, dating is kinda off because your baby grows at different rates by then. You could just have a baby that hasn't hit the growth spurt yet. LO might not hit one until you get into the 3rd Trimester.

    At my sisters 20 week her LO measured almost 2 weeks ahead but by her 31 week she was back on target. 

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  • 1happygirl7821happygirl782
    I haven't had this happen to me but I always thought that they considered being off by up to two weeks relatively normal.  Did they measure your fundal height?
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  • lderealderea
    my fundal height is on target.  I think it's just that the ultrasound tech kept on commenting on how my dr's office "chose" to stay with "their date" instead of the ultrasound one.  Then at the end she said "well, looks like he'll be here arond December 30th now, you better make sure you have him before the year if out"  and my EDD is still December 18th.  But then again, she could be a total whackadoodle, which is why I am talking to my doctor, not listening to her.  
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  • 1happygirl7821happygirl782
    Ehhh....I think she sounds like a whackadoodle!  Don't stress.  Like LovesMM said, maybe your LO is yet to go through a growth spurt.  If everything else looks and measures normal, I wouldn't worry too  much.
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  • mb1210mb1210

    At my first appt, they gave me a due date based on my last period. The ultrasound had me further ahead. Depending on who I see in the office depends on which one they are going off of. Some are determined to go off of my last cycle- which doesn't make sense becuase I was irregular- and then others go off of the first US.

    Especially at this point, I don't think the US are completely accurate. Every baby is different too. Your baby, like mentioned above, may have just not gone through a growth spurt yet. It may also depend on you and your SO builds- if you're smaller, maybe that has something to do with baby being smaller. I don't know, I'm just brainstorming. The numbers that they give are just estimates. They aren't necessarily exactly what your baby is going to be.

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  • Cheekers2010Cheekers2010 member
    As the pp's said, u/s measurements can be way off especially after 20 weeks.  I was measuring 2 weeks big for awhile which totally freaked me out, then I was right on and now I'm measuring 1 week big.  You can't take it all too seriously.
    Lilypie - (vGZN)

    Lilypie First Birthday tickers
    BFP2: 10/27/13(edd 7/10/14) "Speck" ~ M/C 12/5/13
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