نتایج جستجو برای: crown rump length
تعداد نتایج: 325000 فیلتر نتایج به سال:
OBJECTIVES To validate recent guidance changes by establishing the performance of cut-off values for embryo crown-rump length and mean gestational sac diameter to diagnose miscarriage with high levels of certainty. Secondary aims were to examine the influence of gestational age on interpretation of mean gestational sac diameter and crown-rump length values, determine the optimal intervals betwe...
Morphogenesis of palate was studied in normal and 5-fluorouracil-treated hamster fetuses. The results showed that normal palatal development was completed between days 12 and 13 of gestation. In 5-fluorouracil-assaulted palate the reorientation of shelves from a vertical to horizontal plane was delayed. Crown-rump length, gestational age and fetal weight were reliable predictors of the stages o...
There are several reports of electron microscopic studies on the epidermis of human fetuses and/or embryos: BREATHNACH and WYLLIE (1965a, 1965b) reported on the ultrastructure of the epidermis in human fetuses 12 and 14 weeks of menstrual age: RIEGEL (1965) in human fetuse 25 to 60mm long in crown-rump length; HASHIMOTO et al. (1966) in human fetuses 12 to 22 weeks of menstrual age, 60 to 180mm...
BACKGROUND Previous studies have demonstrated a correlation between first-trimester size and birth weight. It is not known, however, whether low birth weight is related to first-trimester growth. We sought to determine whether the risk of low birth weight and birth weight that was low for gestational age is related to the size of the embryo or the fetus in the first trimester. METHODS From a ...
Estimating gestational age in resource-limited settings is prone to considerable inaccuracy because crown-rump length measured by ultrasound before 14 weeks gestation, the recommended method for estimating gestational age, is often unavailable. Judgements regarding provision of appropriate obstetric and neonatal care are dependent on accurate estimation of gestational age. We determined the acc...
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