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The measurement of CRL is useful in determining the gestational age (menstrual age starting from the first day of the last menstrual period) and thus the expected date of delivery (EDD).
Different babies do grow at different rates and thus the gestational age is an approximation.
Cardiac activity should be present in an embryo with a CRL ≥7 mm .
If it not detected at this size on transvaginal scanning performed by an experienced operator, it is an indicator of failed early pregnancy (missed miscarriage).
It has been reported that patients in whom MSD (mean sac diameter) is less than 5 mm greater than crown rump length (i.e.
Crown-rump length (CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump).
It is typically determined from ultrasound imagery and can be used to estimate gestational age.