"The estimated date of delivery (EDD) should be calculated by last menstrual period (LMP) unless 1:"
"The estimated date of delivery (EDD) should be calculated by last menstrual period (LMP) unless 1:"
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"The gestational age (GA) of an embryo/fetus is most accurately determined by measuring the crown rump length (CRL) in the first trimester. The later the pregnancy, the larger the standard deviation of the estimated gestational age and thus estimated date of delivery (EDD) is less accurate. Mean sac diameter (MSD) before a fetal pole is identified and biparietal diameter (BPD) after 11 weeks can also be used to support the calculation of the gestational age."