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A 30-year-old female asked:

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

1 doctor answer • 1 doctor weighed in
Dr. Robert Kwok
Dr. Robert Kwokanswered
Pediatrics 35 years experience
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).
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Last updated Mar 2, 2014

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Child health

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