Intrauterine Gewichtsschätzung mittels Ultraschall

Abstract

At the Department of Gynaecology and Obstetrics of the University of Mainz, the foetal weights were estimated in 196 foetuses between 24 and 42 weeks of gestation. All estimates were based on sonographic determination 0-6 days prior to delivery. In a prospective study the equations of Hansmann, Schillinger et al., Campbell and Wilkin, Warsof et al., Shepard et al., Higginbottom et al., Thurnau et al. and an own unpublished formula of Merz were compared. In addition, with the aid of computer analysis, a new equation for predicting foetal weight was evolved from the data measured in this study. This formula should be valid for all weight groups. In 25.5% of the newborn the actual birth weights ranged from 610 to 2499 g, in 42.9% from 2500 to 3499 g and in 31.6% from 3500 to 4520 g. On comparing the individual equations for the entire study group, the most reliable formulas for estimating foetal weights were found to be those of Shepard et al. (72.4%), Hansmann (61.2%) and Merz (61.2%). In the very low birth-weight range less than 2500 g the formula of Shepard et al. proved to be the most reliable for estimating foetal weight with 72%. In the group between 2500 and 3499 g reliability in estimating foetal weight was over 60% with the equations of Shepard et al. (72.6%), Hansmann (67.9%) and Merz (61.9%). In the birth-weight group of 3500 to 4520 g the most reliable formula for predicting foetal weight was found to be that of Schillinger et al. (91.9%), Hansmann (83.9%), Shepard et al. (72.6%) and Merz (69.4%). The formula which was derived from own data was as follows: W (g) = -3200.40479 + 157.07186 AC (cm) + 15.90391 (BPD)2 (cm). With this formula we obtained 71.4% reliability in predicting foetal weight with a mean absolute weight difference of 221 g for the complete study group. Are of validity for this formula could be defined as follows: BPD 7.0-10.5 cm AC 21.8-36.5 cm (all measurements from outer to outer margin).

Fetal Weight Estimation by 2D and 3D Ultrasound: Comparison of Six Formulas

“…Hansmann and coworker reported an accuracy of ± 9 % for 68 % of all cases and ± 18% for 95 % of all cases [3,18]. Merz and coworkers reported a mean absolute deviation of 221 g and an accuracy of ± 10% for 71,4 % of all cases [4], the values obtained in our study were 249 g and 73 %, respectively. For Hadlock's four-parametric equation applied the mean error expressed as percentage is published with a value of -7,5% ± 7,3% [5].…”

Finding the Best Formula to Predict the Fetal Weight: Comparison of 18 Formulas

“…Hart et al [18] recently developed a new formula including AC, FL, HC and maternal weight to predict the EFW in macrosomic fetuses, and compared this formula with seven different formulas (Hadlock I [4], Hadlock II [4], Hadlock III [4], Hadlock IV [4], Warsof [13], Campbell [1] and Merz [6]). They concluded that the new formula (the lowest mean absolute percentage error 3.69%, range 0.05-13.57) allows better weight estimation in the macrosomic fetus.…”

“…The estimated fetal weight (EFW) meant physicians could predict an intrauterine growth retardation or macrosomia, and lead to change of clinical management involving induction or delay of labor in deciding the method of delivery. There are several mathematical formulas that use different fetal structures to predict the fetal weight [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. The accuracy and reliability of these formulas may differ and low values can adversely affect physicians' decisions.…”

Prospektiver Vergleich von reifen hypotrophen und eutrophen Neugeborenen während der ersten Lebensmonate

“…Bei allen Eltern wurden eine ausf ü hrliche Anamnese zu Lebensgewohnheiten und Schwangerschaftskomplikationen, insbesondere zum Auftreten von Hypertonie und / oder Pr ä eklampsie sowie biometrische Daten erhoben. Die pr ä natale Entwicklung der Feten wurde anhand sonografi scher Befunde wie biparietaler Kopfdurchmesser (BPD), Abdomenumfang (AU), Gewichtssch ä tzung nach Merz [14] , Fruchtwassermenge und Doppler-sonografi e der Aa. uterinae, der A. umbilicalis sowie der fetalen A. cerebri media beurteilt.…”