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A member asked:

I wanted to know how accurate early ultrasounds (first trimester) are in conception dating? if i was 5 weeks4days 9/23/13 putting conception 25-28 of aug could i have still concieved 7/28/13

4 doctors weighed in across 2 answers
Dr. Elise Sadoun answered

Specializes in Family Medicine

No: An ultrasound at 5 weeks is extremely accurate. It is impossible for you to have conceived in july.

Answered 2/24/2014

4.4k views

Thank

Very accurate.: Provided that the individual sono graphed is reliable.;the earlier sonograms are usuall more accurate.

Dr Kuitems and another doctor agreed

Answered 4/21/2015

2.9k views

Thank

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Is u/s dating in first trimester more accurate that going by LMP? EDD changed & going by ultrasound now...

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How accurate are abdominal ultrasounds in first trimester for dating how far along you are?

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If my 1st&2nd trimester ultrasounds are giving me a conception date of aug 24-28 is it safe to say i concieved around this time or could I have still concieved from a july 27 encounter being off 4week?

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Four first trimester ultrasounds done at 7 8 10 12 week all come. Up with same conception date. What's it mean??

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I had a 6 week ultrasound and 11 week for dating purposes, they were both high quality and put my conception on or about december 6, how accurate?

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People also searched for:

How often are first trimester ultrasounds off in dating conception?
I read that a dating ultrasound dates back to the date of conception. I.e. Mine was 7w/50 and done on 4/24. Did I conceive around 3/1?
LMP was Feb 18, I have shorter cycles of 25/26 days. 3 first trimester ultrasounds gave me a due date of Nov 19-21 putting conception at Feb 27-29. How accurate are these conception dates? Anyway conception occurred before February 20?
Can a conception date from early ultrasound be off 3 weeks in first trimester.
Are conception calculators online accurate based off first trimester ultrasound?

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