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Varies thought out the pregnancy.

However is not until we measure the Crown rump length CRL that the DUE DATE is set, here is why… The most accurate sonographic measurement correlating with menstrual dates is the CRL, this measurement the crown rump length or CRL is the maximum visible length of the embryo, care must be taken not to include the umbilical cord or yolk sac in the CRL measurement.

Ultrasound image of a gestational sac measuring 5 weeks 1 day.

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Besides balancing my personal life and work, I love fashion, travel, and home decor!! This is the most important information about Dating your pregnancy.

second and third trimesters measured via , , ,• American College of Obstetricians and Gynecologists.

According to the ACOG redating is more reliable using the earliest available and reliable ultrasound examination surrogates.

Ultrasound image of CRL measurement.

Redating a pregnancy may occur when there is a discrepancy between the calculated by the last menstrual period LMP and that by ultrasound.

Methods for estimating the due date.