crown-rump


Also found in: Dictionary, Thesaurus, Financial, Encyclopedia.
Enlarge picture
CROWN-RUMP: Ultrasonographic image of a fetus aged 9 weeks and 3 days. The crown-rump length is highlighted.

crown-rump

(krown′rŭmp′),

CR

The axis for measurement of a fetus, from the tip of the head to the tip of the sacrum.
See: illustration
References in periodicals archive ?
3 cm crown-rump length, the external genitalia were first observed (Inomata et al.
Accuracy of gestational age estimation by means of fetal crown-rump length measurement.
9 g, was carrying a single embryo measuring 30 mm in crown-rump length.
Statistical tests used were analysis of variance (ANOVA) for litter size, analysis of covariance (ANCOVA) using litter size as a covariate for newborn weight and crown-rump length, implantation sites, and resorptions, and repeated-measures ANCOVA for weight changes during pregnancy, where weight of the mother at GD6, 9, 12, 15, and 18 was the repeated measure and weight at GDO was the covariate.
Selbing A: The pregnant population and a fetal crown-rump length screening program, Acta Obstet Gynecol Scand 1983; 62:161-164
In the first experiment with a hill breed, there were no significant differences in fetal weight, fetal weight: fetal crown-rump length (CRL) ratio between C and U groups (p>0.
Yet new guidelines (1) now say not to call an IUP failed until there is a crown-rump length of 7 mm or greater with no cardiac activity.
Revised criteria for the diagnosis of pregnancy failure with endovaginal ultrasound * Crown-rump length [greater than or equal to] 7 mm without a heartbeat * Mean sac diameter of [greater than or equal to] 25 mm with absence of an embryo * Lack of an embryo [greater than or equal to] 2 weeks after a prior ultrasound demonstrated a gestational sac without a yolk sac * Lack of an embryo [greater than or equal to] 11 days after a prior ultrasound demonstrated a gestational sac with a yolk sac
Adam determined that six baseline biomarkers were significantly associated with miscarriage at the 20th percentile: history of subfertility bleeding score of two on a five-point scale, gestational age of the fetus, fetal crown-rump length of 4 mm, and serum levels of progesterone and hCG (32 nmol/L and 1,500 iU/L, respectively).
The fetus weighed 164 g and had a crown-rump length of 15.
Burdi AR et al [10] stated that fetal body weight rather than commonly used crown-rump length or menstrual age is the best reference parameter for assessing either growth of a single organ or in the generation of regression formulae.
An embryo's crown-rump length and fetal heart rate greater than 100 beats per minute predicted viability at 5-6 weeks post conception in a separate study presented at the annual meeting of the Pacific Coast Reproductive Society in Indian Wells, Calif.