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What Is The Error Margin Of An Ultrasound Done At 6 Weeks?

Posted on Tue, 2 Sep 2014

Question: If an ultrasound was done on say the 23rd of September and it stated that the fetus had a gestational age of 6weeks 1 day with a CRL of 6mm is it possible that sexual intercourse from the 12th of August (6weeks prior and what would be 8 weeks gestation) could have been the encounter that caused the pregnancy??

Answered by Dr. Som Biswas (10 minutes later)

Brief Answer:
Yes

Detailed Answer:
Hi,

Thank you for your query. I can understand your concerns.

Yes it is possible as ultrasounds have an error margin of 2-3 weeks.

Regards,

Dr. Som MD

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar

Follow up: Dr. Som Biswas (8 hours later)

I understand that but what I was also told is that margin of error in early ultrasounds are a few days and the error of margin increases during the second and third trimester. Please clarify

Answered by Dr. Som Biswas (9 hours later)

Brief Answer:
Dear XXXXXXX

Detailed Answer:
You asked me , "could have been the encounter that caused the pregnancy??"

My answer still remains : Yes it could have been.

If you ask me " Is it definitely that encounter only ? "

My answer will be : No, and nobody can tell now.

Regards,

Dr. Som MD

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar