The gestational age based on the last menstrual period and based on the first fetal ultrasound in the current pregnancy are compared. If these age estimates are inconsistent, the estimated date of delivery (and, thus, the estimated gestational age) may be changed, depending on the number of we...
Once gestational age has been established based on early imaging, it should not be reassigned. Determination of gestational age is based on the embryonic crown-to-rump length until approximately 13 weeks, or 60 mm, after which time other biometric measures, such as the biparietal diameter, head...
Kenneth F. Trofatter, Jr
Estimation of gestational age was based primarily on ultrasound examinations performed in the early second trimester or otherwise on the date of the last menstrual period. Preterm birth was defined as birth before 37 completed weeks of gestation and was categorized as extremely and very preterm (22...
2,3 Test results are interpreted based on Liley's zones relative to gestational age. Again, inaccurate assessment of gestational age will lead to errors in assessing the severity of fetal sensitization by the delta OD 450. Fetal growth assessment, either clinically or by ultrasound evaluation, ...
Traditionally estimation of gestational age is based on the menstrual history and the findings of bimanual and abdominal examination. Both of these may be subject to considerable error. Many units now perform ultrasound measurements as a routine in all pregnancies to provide an objective estimate of...
Exposure variables were birthweight and gestational age. Birthweight has been considered binary in many previous studies in this field. However, in the present study, to take into account different levels of low birthweight, and based on previous studies [30, 31], birthweight has been categorize...
gestational age based on the sex-specific reference by Williamset al. Because it is based on percentile distributions, this classification categorizes some normal, constitutionally small, newborns at the lower end of the normal fetal growth distribution as growth restricted. In addition, the ...
The machine learning model is based on ultrasound images from two independent datasets: one for training and internal validation, and another for external validation. During validation, the model was blinded to the ground truth of gestational age (based on a reliable last menstrual period date and...
Gestational age was estimated based on the date of the self-reported LMP; if the LMP was unreliable or if there was a significant discordance between the clinical estimate and LMP (>2 weeks), the clinical estimation of gesta- tional age was used22. Maternal height was measured during ...