A member asked:

How accurate is a transvaginal ultrasound for determining exact due date. i was due may 28 2012. but it didn't match up with suspected time of ovulati?

4 doctors weighed in across 2 answers
Dr. Nikolaos Zacharias answered

Specializes in Maternal-Fetal Medicine

Trust U/S.: Ultrasound in the first 20 weeks of pregnancy is more accurate than menstrual dates, provided it is performed by a reputable center.

Answered 3/26/2013

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Early is accurate: An ultrasound early in the first trimester is considered very accurate whereas ovulation is harder to predict.

Answered 7/16/2013

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