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A member asked:
Lmp says edd 7/24/14 but first vag u/s says 7/20/14 does that mean i ovulated 10days after lmp rather than 14days?
2 doctors weighed in across 2 answers
U/S not perfect: The error in an early first trimester u/s is +/- 5 days. If the u/s measurements calculate a due date of 7/20/2014, it means your "real" due date could be as early as 7/15/2014 or as late as 7/25/2015. Your LMP due date is within the accuracy range of the u/s. You are correct that LMP is somewhat imprecise. Not all women ovulate 14 days after the first day of your period.
Answered 2/13/2015
4.1k views
No: The edd given with vag u/s is an average of several crown-rump measurements. It gives an edd with a range of 3-5 days usually. If a woman has cyclic menses and the vag u/s is within 3-5 days of the edd by lmp, then the LMP date is used. Vag u/s dating is best used when there are discrepancies in lmp.
Answered 3/22/2020
4.1k views
Related Questions
A member asked:
On 6/23 i was 5w5d by crl with an edd of 2/17. Lmp was 4/27, the edd should have been 2/1 by lmp. But16d dif is this bc of irreg pp and late ovulation?
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I had sex on feb 18 and feb 26. My LMP was 2/9, ovulation 2/23! us 15 weeks 2 days on 5/23 with edd of 11/11. When did i conceive?
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If due date was june 3 based on LMP of aug 27, then it changed to may 31 after u/s, could this be bcuz i ovulated sooner? Conception date different?
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Do i go by due date or my LMP when it comes to figuring out when i ovulated?
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