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A member asked:
Are two weeks added to ultrasound gest. age like when calculating from the lmp? eg, u/s on jan 13 estimated 9+1 age. so i conceived roughly nov 9?
A doctor has provided 1 answer
Yes: Ultrasound for pregnancy uses the same 40 week gestation time as OB to be consistent. So, the reference date is the time of the last menstrual period, not ovulation. Honestly, i don't know why the medical community hasn't changed this except that it has been accepted for so long.
Answered 5/16/2015
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Related Questions
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I got my first ultrasound at 16 weeks. My LMP came to december 5th and conception date was december 19th. Is it possible i could of conceived jan 10?
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If my ultrasound matches lmp, when would I most likely have conceived?
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What does it mean if LMP and early ultrasound match by 5 days? Does that mean i for sure conceived within + or - 7 days of that date?
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If my lmp and ultrasound match to exact date does that mean I conceived 2 weeks after my lmp?
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