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when you get an ultrasound is it dating you from lmp or conception?

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weezyanna09

Asked by weezyanna09 at 4:59 PM on Apr. 27, 2011 in Pregnancy

Level 3 (18 Credits)
Answers (4)
  • it goes by your LMP, then they measure they baby and get an average based on how baby is measuring + LMP.
    tnm786

    Answer by tnm786 at 5:01 PM on Apr. 27, 2011

  • so if my ultrasound said 13wks and 5days thats from lmp even if i didnt memeber when it was?
    weezyanna09

    Comment by weezyanna09 (original poster) at 5:07 PM on Apr. 27, 2011

  • the ultrasound tech will tell you both lmp date and conception date. Your due date is always counted 40 weeks from your lmp
    hill_star03

    Answer by hill_star03 at 6:59 PM on Apr. 27, 2011

  • It dates from the beginning of pregnancy, which is 2 weeks before conception. If you have regular cycles, that will line up with you LMP. But if your cycles are irregular, it won't line up. Your "due date" is 40 weeks from the beginning of your cycle, which if you have a 28 day cycle, is from you LMP. If your cycle is not 28 days, the dates will never line up. It is all guess work anyway, since pregnancies last from 38 to 42 weeks.
    fancyjane

    Answer by fancyjane at 7:22 PM on Apr. 27, 2011

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