A member asked:

Do ultrasounds add two preconception weeks when measuring baby? if baby measures 12 w is this supposed to date to lmp or conception?

A doctor has provided 1 answer
Dr. Robert Kwok answered

Specializes in Pediatrics

Yes. LMP.: The gestational age (number of weeks pregnant) stated in the result of the ultrasound already added the 2 preconception weeks. If the ultrasound dating says 12 weeks gestation, that means 12 weeks since the estimated start of the last menstrual period (lmp).

Answered 3/2/2014

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