“By convention, obstetricians date pregnancy from presumed first day of the last normal menstrual period (LMP). This is gestational age, which in embryology is superfluous because gestation does not begin until fertilization of an oocyte occurs. Embryonic [or fetal] age [also described as fertilization or conceptional age] begins at fertilization, approximately 2 weeks after the LNMP…. The day on which fertilization occurs is the most accurate reference point for estimating [embryonic or fetal] age ….” The
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