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How accurate are ultrasounds for dating pregnancy at 13weeks..my lmp period was 10/27/2011 giving me a due date of 8/02/2012 but when the ultrasound dated me it gave me a lmp of 10/18/2011 due date 7/24/2012?


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replied June 4th, 2012
Pregnancy Calendar Conception : When did I Conceive ? Answer A3
Hi, and thanks for your medical question on eHealth forum!

Gestational age calculated by the longest length of the baby in first 12 weeks usually matches the last menstrual period (LMP) method plus minus a week. Hence this difference could come up between the two methods. In the second trimester this difference can be of plus minus 8-9 days. In third trimester the difference can be up to plus minus 2 weeks. A differnec of 10 days between the two methods at 13 weeks is normal. If in doubt, please consult your gynecologist. Hope this helps. Take care!


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