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A member asked:
Ultrasound dates use gestation age which is based on lmp not on conception correct ? so i couldn't have gotten pregnant before the date that was given
A doctor has provided 1 answer
Maybe: EDD are based on 40 weeks from last known normal menstrual period, or 38 weeks from known conception date.U/S dating is based on a database of average fetal anatomic measurements (size of head, abdomen, leg etc) for a particular age.The computer in the ultrasound machine calculates an EDD based on the average of these measurements. In the first trimester, U/S dates are accurate within 5-7 days
Answered 8/2/2014
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Related Questions
A member asked:
How can conception date determined by early trans u/s done at 6 weeks 3days be accurate if you can still get pregnant w/in the 2 weeks of gestational age?
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A member asked:
On 12/10/12 my gestational age was 8weeks with an estimated LMP to be 10/15/12. Whenwas the latest date that conception could have happened?
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A member asked:
With a normal pregnancy, all ultrasounds including ones in the 1st trimester showed LMP 10/15/12. Could conception have occurred after 11/7/12?
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A member asked:
Why does my gestational age on sonogram date back to April 15th when my lmp was march 24th? (I have a due date of January 13 it was around December 30
3 doctors weighed in across 2 answers
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