A member asked:

What does it mean when lmp dating by ultrasound in first trimester assumes a 28 day cycle?

A doctor has provided 1 answer

Family practice : It is an u/s to determine normal growth and determine proper due date if unsure of lmp. Usually done at 18 weeks gestation.

Answered 6/19/2013

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Are first trimester ultrasounds ever exact in dating?

A doctor has provided 1 answer