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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How Accurate Are First Trimester Ultrasounds For A Conception Date?

How accurate are first trimester ultrasounds for a conception date? I need to know which man is my unborn childs father. My due due is 2/27/2011 which was first given to me on July 8,2010 at an ultrasound daing me 6 and a half weeks. Had two more ultrasounds done: One on August 27, dating me 13 and 5 days with my due date still 2/27/2011 and another on October 11, dating me 20 weeks 1 day with my due date still 2/27/2011. If I had intercourse with guy A on May 23 and guy B on June 5, who is the father? Is two weeks difference enough time to be able to tell this? I also have had irregular periods and only have ultrasounds to go by, is the information given to me by an ultrasound accurate enough to determine paternity? THANK YOU!
Wed, 27 Jan 2016
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OBGYN,  's  Response
Hallow Dear,

All the three seatings of ultrasound scanning are giving you the same due date of delivery, which is 02/27/2011. Considering this date, you should have your last menstrual period somewhere around 05/20/2010.

Considering your menstrual cycle of 30 days, your likely date of egg release would be around 06/06/2010 since the egg release takes place 14 days prior to the next menses. The life of egg is 24 hours while the sperms are active for 72 hours. Hence the possibility of the father seems to be guy B with whom you had intercourse on June 5, 2010.

Howeverif you want to assess the paternity for legality purpose, you will have to get DNA test done.

I am sure this solves your dilemma.

Dr. Nishikant Shrotri.
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How Accurate Are First Trimester Ultrasounds For A Conception Date?

Hallow Dear, All the three seatings of ultrasound scanning are giving you the same due date of delivery, which is 02/27/2011. Considering this date, you should have your last menstrual period somewhere around 05/20/2010. Considering your menstrual cycle of 30 days, your likely date of egg release would be around 06/06/2010 since the egg release takes place 14 days prior to the next menses. The life of egg is 24 hours while the sperms are active for 72 hours. Hence the possibility of the father seems to be guy B with whom you had intercourse on June 5, 2010. Howeverif you want to assess the paternity for legality purpose, you will have to get DNA test done. I am sure this solves your dilemma. Dr. Nishikant Shrotri.