Pregnancy Forum - Fetal age determination

Pregnancy Forum > Pregnancy Forum > Fetal age determination

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Q: Fetal age determination

asked by: DoctorQuestion on July 18th, 2008

If my obgyn says that my due date is 10/15/08 by the u/s when can be the date I had sex that caused the pregnancy? My LMP was 1/5/08 and my next period is usually 31-32 days and sometimes it's irregualr.

Replies(2)

Dr. Nikola Gjuzelov , MD

replied on July 21st, 2008

Pregnancy Answer A4433

Ultrasound apparatus calculates the pregnancy age not according to your LMP but according to certain dimensions of the fetus. In your case, the calendar due date and ultrasound due date are separated by only 3 days so I can assume that you conceived somewhere between 20th and 30th of January, 2008.

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Comments (1)

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