length

[length]

an expression of the longest dimension of an object, or of the measurement between its two ends.

crown-heel length (CHL) the distance from the crown of the head to the heel in embryos, fetuses, and infants; the equivalent of standing height in older persons.

Measuring an infant's crown-heel length. From Lammon et al., 1996.

crown-rump length (CRL) the distance from the crown of the head to the breech in embryos, fetuses, and infants; the equivalent of sitting height in older subjects.

cycle length in cardiac pacing terminology, the time interval in milliseconds from one event to the next; it is the inverse of the intrinsic rate (beats per minute) or the paced rate (pulses per minute).

focal length the distance between a lens and an object from which all rays of light are brought to a focus.

crown-rump length

(Cr, CRL) (krown-rŭmp length)

A measurement from the vertex of the cranium to the midpoint between the apices of the buttocks of an embryo or fetus, whichpermits approximation of embryonic or fetal age.
See also: crown-heel length

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

crown-rump length

(CRL) (krown-rŭmp length)

A measurement from the vertex of the cranium to the midpoint between the apices of the buttocks of an embryo or fetus to assess of embryonic or fetal age.

Medical Dictionary for the Dental Professions © Farlex 2012

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References in periodicals archive

In cats with 3.2-3.3 cm crown-rump length, the external genitalia were first observed (Inomata et al., 2009).

Intrauterine Development of Female Genital Organs in Cavia porcellus (Rodentia: Caviidae)

Although the fetuses of both DRs and CRs were obtained in the morning 21 DPC, the weight (6.27 g versus 3.61 g), crown-rump length (4.05 cm versus 3.30 cm), nasooccipital length (1.67 cm versus 1.34 cm), tail length (1.53 cm versus 1.34 cm), and waist circumference (1.45 cm versus 1.13 cm) were significantly lower among the morphologically normal fetuses of the DRs compared with those of the CRs (Table 4).

Importance of maternal diabetes on the chronological deregulation of the intrauterine development: an experimental study in rat

Given the inherent inter--and intraob-server variation in ultrasound measurements, he and his colleagues favor more conservative criteria for the definitive diagnosis of early pregnancy failure: a crown-rump length cutoff of greater than 7 mm instead of 5 mm, and a mean gestational sac diameter cutoff of more than 25 mm.

Early pregnancy failure: diagnosis hinges on key steps

Multiple regression analysis in the nondiabetic group demonstrated that for [log.sub.10] visfatin, there were no significant contributions provided by maternal age (P = 0.286), BMI (P = 0.429), smoking status (P = 0.816), method of conception (P = 0.275), parity (P = 0.275), racial origin (P = 0.449), or fetal crown-rump length (P = 0.447).

Maternal serum visfatin at 11-13 weeks of gestation in gestational diabetes mellitus

Accuracy of gestational age estimation by means of fetal crown-rump length measurement.

Four years' experience with an interlaboratory comparison program involving first-trimester markers of Down syndrome

The crown-rump length measurements of fetuses of women who screened positive were significantly shorter than fetuses of women for whom a negative screen result was obtained.

Nuchal translucency as a method of first-trimester screening for aneuploidy

Of eight females captured on 30 March 1926 that were examined for reproductive activity, seven were pregnant with embryos averaging 17.4 (13-20) in crown-rump length and one evinced no reproductive activity.

Bats of Saint Martin, French west indies/Sint Maarten, Netherlands Santilles/Murcielagos de Saint Martin, Indias Occidentales francesas /Sint Maarten,Antillas holandesas

A 1999 American College of Obstetricians and Gynecologists (ACOG) practice bulletin states that labor may be induced for logistic reasons such as psychosocial factors and distance from hospital, as long as 1 of these 4 criteria is met: (1) fetal heart tones have been documented for 20 weeks by nonelectronic fetoscope or for 30 weeks by Doppler; (2) it has been 36 weeks since a positive serum or urine human chorionic gonadotropin pregnancy test was performed; (3) ultrasound measurement of crown-rump length, obtained at 6 to 12 weeks, supports a gestational age of at least 39 weeks; (4) ultrasound obtained at 13 to 20 weeks confirms the gestational age of at least 39 weeks determined by clinical history and physical examination.

What are the risks and benefits of elective induction for uncomplicated term pregnancies?

Litter size, birth weight, and crown-rump length were determined at birth, and pups were allowed to lactate and grow without additional herbicide exposure so that they could be subjected to additional immune, endocrine, and behavioral, studies, the results of which will be reported in a separate article.

Developmental toxicity of a commercial herbicide mixture in mice: I. Effects on embryo implantation and litter size. (Articles)

macrotis (TTU 82468; embryo crown-rump length = 27.5mm) was collected on 29 May 2001 at the same locality in BBRSP as the previously reported L.

Noteworthy records of bats from the Trans-Pecos region of Texas. (General Notes)

The measurement should be dependent on crown-rump length, he said.

Nuchal Translucency Screen Highly Effective