A member asked:

My obgyn isn't going off my lmp march 24th. why does my sonogram date back to april 15th.

A doctor has provided 1 answer

Sono more accurate: variations in ovulation day, cause us to use sonogram measurement of the baby to determine a more accurate due date. when the date estimates are close, no change in due date, when difference is larger, use the sonogram estimated due date.

Answered 9/7/2017

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