Get your Health question answered in 3 easy steps
A Doctor will be with you shortly
Ask a Doctor Now
133 Doctors are Online

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 : 2572 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
Doctor :   It seems you have moved out of the chat
window. Please log in back if you have medical queries
Doctor :   hi
Doctor :   this is Dr. xxxx
Doctor :   It seems you have moved out of the chat
window. Please log in back if you have
medical queries
Doctor :   hi
© Ebix, Inc. All Rights Reserved.
All the information, content and live chat provided on the site is intended to be for informational purposes only, and not a substitute for professional or medical advice. You should always speak with your doctor before you follow anything that you read on this website. Any health question asked on this site will be visible to the people who browse this site. Hence, the user assumes the responsibility not to divulge any personally identifiable information in the question. Use of this site is subject to our Terms & Conditions
Already Rated.
Your rating:

Ask a Doctor