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Ultrasound scan

How is a conception date determined from an ultrasound scan?

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Anonymous

Asked by Anonymous at 12:28 PM on Apr. 14, 2009 in Pregnancy

Answers (11)
  • They measure the long bones and determine approximate age based on length.
    BradenIsMySon

    Answer by BradenIsMySon at 12:31 PM on Apr. 14, 2009

  • So how is the conception date determined?
    Anonymous

    Answer by Anonymous at 12:33 PM on Apr. 14, 2009

  • If i measure 12w4d from an ultrasound scan does this mean i concieved 10w4d ago? or 12w4d ago?
    Anonymous

    Answer by Anonymous at 12:35 PM on Apr. 14, 2009

  • When you get an approximate age, then you get an approximate conception date. They just count backwards and deduce and Voila! conception date. I had my first scan and they said 19 weeks and three days. So, you concepted on June 4. It's all just guesstimating and going by the babies size.
    BradenIsMySon

    Answer by BradenIsMySon at 12:35 PM on Apr. 14, 2009

  • They measure and determine the approximate age and go back that many days and that is when you conceived (not necassarily when you had sex though since the little swimmers can stick around a few days).
    aeneva

    Answer by aeneva at 12:37 PM on Apr. 14, 2009

  • They mean 12wks and 4 days.
    BradenIsMySon

    Answer by BradenIsMySon at 12:37 PM on Apr. 14, 2009

  • Yeah, what she said.
    BradenIsMySon

    Answer by BradenIsMySon at 12:37 PM on Apr. 14, 2009

  • They determine date of conception by measurement, but the dates are always less than accurate and change as the baby changes. Ultrasounds rarely give an accurate measurement and/or weight. They are always off by a few pounds (for instance, they tried early on to make me get an elective cesarean, claiming my son would be ten pounds by their ultrasound measurement. Eight pounds. He was eight pounds. Glad I told them to eff off.) As the baby becomes larger over time, it's easier to get a more accurate due date and thus conception date. But early on the results aren't as accurate as being determined by Last Menstrual Period would be.
    littlemrsmarcel

    Answer by littlemrsmarcel at 12:38 PM on Apr. 14, 2009

  • so if i measured 12wks4d did i concieve 12wks4d ago or 10wks 4d ago??
    Anonymous

    Answer by Anonymous at 12:42 PM on Apr. 14, 2009

  • They measure gestational age from LMP, not conception. If it says 12 wks 4 d, you concieved about 10 wks 4 d ago. It's all estimates any way and can be off by a few days.

    riotgrrl

    Answer by riotgrrl at 12:46 PM on Apr. 14, 2009

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