title: Analysis of factors influencing the ultrasonic fetal weight estimation.
abstract: OBJECTIVE
  The aim of our study was the evaluation of sonographic fetal weight estimation taking into consideration 9 of the most important factors of influence on the precision of the estimation.
  
  
  METHODS
  We analyzed 820 singleton pregnancies from 22 to 42 weeks of gestational age. We evaluated 9 different factors that potentially influence the precision of sonographic weight estimation (time interval between estimation and delivery, experts vs. less experienced investigator, fetal gender, gestational age, fetal weight, maternal BMI, amniotic fluid index, presentation of the fetus, location of the placenta). Finally, we compared the results of the fetal weight estimation of the fetuses with poor scanning conditions to those presenting good scanning conditions.
  
  
  RESULTS
  Of the 9 evaluated factors that may influence accuracy of fetal weight estimation, only a short interval between sonographic weight estimation and delivery (0-7 vs. 8-14 days) had a statistically significant impact.
  
  
  CONCLUSIONS
  Of all known factors of influence, only a time interval of more than 7 days between estimation and delivery had a negative impact on the estimation.
authors.affiliation: Department of Obstetrics and Gynecology, University Hospital Schleswig-Holstein, University Kiel, Kiel, Germany. iheer@email.uni-kiel.de
authors.forename: Ivo Markus
authors.initials: IM
authors.lastname: Heer
authors.forename: Carolin
authors.initials: C
authors.lastname: Kumper
authors.forename: Nadin
authors.initials: N
authors.lastname: Vogtle
authors.forename: Susanne
authors.initials: S
authors.lastname: Muller-Egloff
authors.forename: Martin
authors.initials: M
authors.lastname: Dugas
authors.forename: Alexander
authors.initials: A
authors.lastname: Strauss
mesh_terms: D000293:Adolescent; D000328:Adult; D000653:Amniotic Fluid / Q000000981:diagnostic imaging; D015992:Body Mass Index; D005260:Female; D020567:Fetal Weight; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D007746:Labor Presentation; D008297:Male; D033261:Maternal-Fetal Relations; D008875:Middle Aged; D036801:Parturition; D010920:Placenta / Q000000981:diagnostic imaging; D011247:Pregnancy; D015203:Reproducibility of Results; D013997:Time Factors; D016216:Ultrasonography, Prenatal / Q000379:methods* / Q000706:statistics & numerical data