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Accuracy of conception dates in ultrasound - Online Doctor Chats

Date : 21-Feb-2012
User rating for this question
Very Good Posted in: Pregnancy
Answered by

General & Family Physician
Practicing since : 2005
Answered : 2305 Questions
User :   This is an OBGYN question. Please direct me to an OB GYN to help me with my question. Thank you! :)
Here is my question: 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 (stopping taking birth control pills on April 25, 2010 and was supposed to resume taking them on May 2, 2010 but I did not-- I had no physical period since the time I got pregnant, this is why I say they are irregular and void) and only have ultrasounds to go by, is the information given to me by an ultrasound accurate enough to determine paternity? THANK YOU!
Doctor :   Hi
Doctor :   I am Dr. xxxxxx
Doctor :   I am reading the Q. Please wait
User :   Hello... are you an obgyn?
Doctor :   Hi
User :   hELLO
Doctor :   I am a General Physician, I believe I can help you within my expertise and If required I shall recommend a specialist.
Doctor :   analysisng the dates
User :   okay thank you
Doctor :   Ultra sound will not tell u who is the father
Doctor :   it is not acuarte for that
Doctor :   The only way is amniocentesis and doing the typing of the chromosomes
Doctor :   from baby and father
Doctor :   The gap from GuyA and B is very small
User :   I understand that, but with the dates provided and a two week difference, would it be able to have some type of an idea
Doctor :   2 weeks in not sufficient
Doctor :   if it were 2 mon that matters
User :   could I speak to an obgyn? I would like ask about the ultrasounds and things like that
User :   I came here to get a second opinion from my doctor which said it would be a sufficent time frame and that it would not be possible for it to be from the May 23rd encounter
Doctor :   Ok
Doctor :   Specialist will give opinion only thru emails
Doctor :   They are not avaiabale for chatting
Doctor :   You can request speciality opinion on line
User :   ok than kyou
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Doctor :   hi
Doctor :   this is Dr. xxxx
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Doctor :   hi
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