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Query about date of conception and karyotyping - Online Doctor Chats

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

General & Family Physician
Practicing since : 2009
Answered : 595 Questions
User :   Hi, may I answer your health que
Doctor :   HI,
Doctor :   Dr xxxx here
User :   Hello
Doctor :   How can i help you ?
User :   My question is in regards to conception dating using an ultrasound... how accurate is this?
User :   My girlfriend told me that on the 10th she had an ultrasound and she is 6 weeks pregnant, does that mean she had sex 6 weeks ago?
Doctor :   the ultrasound dating is not relaible
Doctor :   always the date formulated on first day of last menstural period is more reliable than ultrasound
Doctor :   commonly the average of both dates is considered
User :   OK, I guess I'm still a little confused.... she also told me they said that she ovulates late, what does that mean?
Doctor :   it means the ovum production in her is late, generally it occurs on 14 th day of the menstrual cycle
Doctor :   ovum means egg
Doctor :   ultrasound dating is not accurate
Doctor :   it do not give the exact date of fertilization or the intercourse
User :   The first day of her last period was apparently on the 21st of October, and she told me that her due date is August 4...... if she is 6 weeks pregnant then I look back at the calender and that means she would have been pregnant on the 29th of November, does that mean she had sex on or around that date?
User :   Is it accurate within 2 weeks? I had sex with her on October 18th and the last time was November 11 is it possible that I am the father or do the numbers not work out?
Doctor :   if her first day of LMP is 21 st oct then egg would have been released in the begning of first week of november and intercourse at that time is fruitful
User :   My bad I meant the 29th of October
User :   So if I had sex with her on the 11th of November is there a possibility that I could be the father?
Doctor :   yes, fair enough possibility
User :   If I didn't ejaculate fully inside would that make any difference, I know that it doesn't take much but she has been having sex with her ex regularly throughout late October through early November....... unless he isn't fertile does that make a difference?
Doctor :   could not be certain of it , but all pregnancy need not require complete ejaculation inside , sperm placed on the female thigh can result in pregnancy
User :   Oh...... does that mean that paternity is the only true way at this moment?
Doctor :   Paternity by what means ?
User :   Do you have any suggestions as to what options I have?
Doctor :   if she continues the pregnancy, karyotyping done around 20th week would give a detailed insight
User :   Is it safe?
Doctor :   if terminated get karyotypiung of the aborted foetus
Doctor :   yes it is safe
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