Early dating ultrasound - Mothering Forums

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#1 of 5 Old 12-01-2011, 11:25 AM - Thread Starter
 
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If you had an early dating ultrasound, did the doctor base the EDD off of the sac measurement, or the embyro?

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#2 of 5 Old 12-01-2011, 02:08 PM
 
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Typically they get the most accurate measurement early on measuring the lil bean (aka baby)


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#3 of 5 Old 12-01-2011, 02:11 PM
 
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Yup, he measures the babe.

 


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#4 of 5 Old 12-01-2011, 02:23 PM - Thread Starter
 
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My ob's office went with the sac measurement for some reason. That date would have been 3/08/11, and that leaves a conception window of 6/8-6/15, give or take. The sac measured three days behind, so an EDD of 3/11/11. Both dates are possible, especially since I had an odd cycle that month because it was right after a miscarriage.

Not that it matters too much - that gives baby three extra days to decide to come out before they start talking c-section. smile.gif

Wife to DH, mama to bikenew.gif DD (7) ribboncesarean.gif, babyf.gif DS born 3/12 ribboncesarean.gif, and have had five early losses. angel1.gif
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#5 of 5 Old 12-02-2011, 09:34 AM
 
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I think they can also base the age on how fast the heartbeat is. I was just reading something about that the other day. I wish I could remember where. Apparently the heart speeds up a certain amount of beats per day in the very beginning so it's pretty accurate if you're having an early enough scan. When I had mine, the little one was 130 bpm, but every time she'd go to measure, the baby would be a bit bigger! Kind of funny. My uterus curves to the back instead of the front so the tech was having a bit of a time getting a good look, I think that's why the measurements kept changing. This also leads me to believe she based the age on the heartbeat instead of the size.

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