Evaluation of Gestational Age Based on Ultrasound Fetal Growth Measurements

Abstract

Monitoring fetal growth and assessing its predictors have important place in antenatal care management. Accurate prediction of gestational age (GA) and birth weight (BW) is clinically important. Standard growth curve chosen should be evaluated to see if it satisfies the criteria for a valid assesment. In this paper, for the purpose of contributing to develop national standards and to evaluate Hadlock's standard data pertaining to 1411 fetuses were examined. Of 1411 normally growing fetuses, one measurement for AC, BPD and FL was taken by ultrasound. GA was assessed via menstrual history which is also confirmed by ultrasonography. Several variables, AC, BPD, FL, FL/AC, BPD/FL and dependent variables (GA & BW) were modelled mathematically. Percentile values, correlation coefficients were calculated and well functioning regression equations were produced for the fetal growth evaluation. Simple correlation model re-confirmed that AC, BPD and FL were well predictors of GA. Via modelling by multivariate regression analysis (adj. R2=937), GA=4.945 (95% CI: 4.661- 5.654) + .606 AC + .105 BPD + .286 FL can be estimated. It couldn't be possible establishing an appropriate equation for prediction of BW with current data. Our study is intended to draw an attention on requirement of national standards although Hadlock's standard growth curve may evaluate fetal development accurately. Forming comprehensive cohort group is under our consideration. The equation we developed (shown in the results), might be a working contribution.

Factors associated with the differential in actual gestational age and gestational age predicted from transrectal ultrasonography in pregnant dairy cows

“…Size and differentiation of maternal and fetal components measured using ultrasonography relative to actual gestational age have been exploited to elucidate reliable parameters to predict gestational age in cattle [1][2][3][4], goats [5][6][7], and humans [8,9]. The manifestation of a heartbeat, crown rump length, occiptonasal length, orbital diameter, abdominal diameter, umbilical cord diameter, uterine diameter, amniotic sac diameter, thoracic diameter, head circumference, and chest depth are all proposed approaches to estimate gestational age [1][2][3][4][5][6][7].…”

Ultrasonic Measurement of Fetal Parameters for Estimation of Gestational Age in Korean Black Goats

“…For example, it is useful monitoring of status of fetus and mother, clinical problems such as restriction of fetal development, or missed observation of breeding time. The ultrasonic measurement of biparietal diameter is routinely measured during human prenatal examinations [7,21]. Recently, abdominal circumference, orbit, lens and heart were also estimated by ultrasonic scanning and relation between these and fetal growth were worked [4,11,15,21].…”

“…The estimation of gestational age by ultrasound is based on the known relationship fetal age and size [21]. Estimation of the gestational age of fetuses would be useful in specific clinical, management, or research applications [5].…”

Quadro citológico vaginal, concentração plasmática de progesterona durante a gestação e medidas fetais em paca (Cuniculus paca Linnaeus, 1766)

“…A estimativa da idade gestacional por ultrassonografia é baseada na correlação entre tamanho e idade fetal (Varol et al 2001). A mensuração do diâmetro biparietal (DBP) é rotineiramente utilizada durante o exame pré-natal em humanos (Torres 2008) e, para De Bulnes et al (1998) e Abreu (2007 é um dos melhores e mais confiáveis parâmetros para estimar com elevada precisão a idade fetal em ovelhas e cabras.…”