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A member asked:
Should the baby's crown to rump measurement in early pregnancy date back to your period or to conception? if baby was 7mm, 6w5d, when was conception?
A doctor has provided 1 answer
LMP, either: Crl 'can' be dated to either menstrual period or conception, but for medical obstetrical purposes it's always dated to the lmp. It's still only a guess.
Answered 11/8/2013
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