Definitions for "CROWN-RUMP LENGTH"
Keywords:  rump, crl, fetus, embryology, unborn
measurement from the top of the head to the bottom of the rump of the fetus
(CRL) Used in embryology to accurately stage the early embryo. Used in clinical ultrasound as a measurement between the periods of 7 to 13 weeks as an accurate estimation of the gestational age. (More? Embryo Stages | Ultrasound Movies)
length between a child's head and buttocks, sometimes used as an estimator of length