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Paternity testing to determine the father of a child - Online Doctor Chats

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

General & Family Physician
Practicing since : 2005
Answered : 2408 Questions
User :   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!
Doctor :   this is Dr here
Doctor :   let me read ur query
Doctor :   ok
Doctor :   give me a few minutes so that i can help u
User :   thats fine
User :   its a terrible issue for me
Doctor :   based on the history u have given, it seems that the date of your ovulation is june 6th 2010
Doctor :   Possible Dates of Conception: June 5 to June 10, 2010
Doctor :   so guy B is the father of the child
Doctor :   guy A cannot be the father of the child
Doctor :   for a matter of fact, ultrasound is not used to determine paternity of a child
Doctor :   if your periods have been regular, and the history given is adequately correct, then as i have mentioned guy B is the father with the conception occuring on june 6th
Doctor :   I hope you have followed my comments
User :   here is the LMP history
User :   the ultrasound calculates (with a conception date of June , 2010 6 and due date of February 27, 2011) that my last menstrual period was May 23rd. I know for sure I did not experience any bleeding and did not have a "period". When I count from April 25th, the start of my last known period, 28 days later is May 23rd. Can this be so? Would birth control not have messed up everything and thrown it out of wack? Counting 14 days after May 23rd is June exactly June 6th, the date that I would be expected to ovulate. I was not ovululating, as I was on birth control, but is it really possible to still be in synch with the pills? That is dead on.
User :   JUNE 6TH* sorry
Doctor :   birth control does not change the period cycles of the body and it just prevents ovulation (shedding of the ovum)
Doctor :   so there is nothing to be confused about
Doctor :   the ultrasound, repeatedly has mentioned the EDD to be feb 27th
Doctor :   so that must be exactly correct
User :   I did not get a period on May 23rd but according to my due date, this is when my LMP should have been
Doctor :   and there are chances that either pills could have caused u to have missed the period , that u did not observe
Doctor :   yes that right
User :   and counting 28 days from April 25th is exactly May 23rd dead on with the ultrasound
Doctor :   yes
User :   so is it even possible that Guy a could be the father based on all this information? I have heard that ultrasounds can be off by 5 days and that sperm can live for 5 days, it he a possibilty at all?
Doctor :   NO
Doctor :   GUY A cannot be the father in any way
Doctor :   as the date of intercourse is not anyway near to the date of your ovulation
Doctor :   A woman is usually able to get pregnant for about 5 days each month, when ovulation occurs.
Doctor :   On average, ovulation occurs 12 to 16 days before the menstrual period begins.
Doctor :   sperm can live for 3 to 5 days in a woman's reproductive tract,
User :   so the five days leading up to June 6th would have made me pregnant? is there an error with ultrasound dates?
Doctor :   no, the ultrasound, take the size of the fetus to calculate
Doctor :   so the chances of being incorrect about the EDD is very less
Doctor :  
if u are still in doubt, the only way to be certain of paternity is to have a paternity test done.
Doctor :   Have u followed my comments ?
User :   would a paternity test be needed in my case or can I rest assured it is guy b for sure without the testing?
Doctor :   it is definite that Guy B is the father
Doctor :   I do understand that doubt may be causing you to become anzious
Doctor :   that can be solved by a paternity test, which will be confirmative
Doctor :   i guess u have moved on to a different page , please log back in if u have any other query
Doctor :   bye for now
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